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Medical Dictionary - Dictionary of Medicine and Human Biology

Medical Dictionary


pseudomnesia (soo-dom-ne′ze-a)
A subjective impression of memory of events that have not occurred. [pseudo- + G. mnesis, memory]

pseudomonad (soo-do-mo′nad)
A vernacular term used to refer to any member of the genus Pseudomonas.

Pseudomonas (soo-do-mo′nas)
A genus of motile, polar-flagellate, non–spore-forming, strictly aerobic bacteria (family Pseudomonadaceae) containing straight or curved, but not helical, Gram-negative rods that occur singly. The metabolism is respiratory, never fermentative. They occur commonly in soil and in freshwater and marine environments. Some species are plant pathogens. Others are involved in human infections. The type species is P. aeruginosa. [pseudo- + G. monas, unit, monad] P. acidovorans a bacterial species found in water, soil, and occasionally in clinical specimens. P. aeruginosa a bacterial species found in soil, water, and commonly in clinical specimens (wound infections, infected burn lesions, urinary tract infections); the causative agent of blue pus; occasionally pathogenic for plants; usually causes infections in humans in whom there is a defect in host defense mechanisms. It is the type species of the genus P.. SYN: blue pus bacillus. P. cepacia SYN: Burkholderia cepacia. P. diminuta a bacterial species found primarily in clinical specimens, rarely in water. P. fluorescens a bacterial species found in soil and water; it is frequently found in clinical specimens and is commonly associated with food spoilage (eggs, cured meats, fish, and milk). P. mallei SYN: Burkholderia mallei. P. maltophilia species now called Xanthomonas maltophilia. See Stenotrophomonas maltophilia. P. piscicida a bacterial species pathogenic for fish. P. pseudoalcaligenes a bacterial species found in a sinus discharge. P. pseudomallei SYN: Burkholderia pseudomallei. SYN: Whitmore bacillus. P. putrefaciens former term for Alteromonas putrefaciens. P. stutzeri a bacterial species found in soil and water, frequently in clinical specimens. P. vesicularis a bacterial species found in the medicinal leech (Hirudo medicinalis) and in water from a stream.

pseudomonilethrix (soo′do-mo-nil′e-thriks)
A nodal trichodystrophy similar to monilethrix but with fractures within the nodal swellings; autosomal dominant inheritance with late onset.

pseudomonomolecular (soo-do-mon-o-mol-ek′koo-lar)
SYN: pseudounimolecular.

pseudomorph (soo′do-morf)
A mineral found crystallized in a form that is not proper to it but to some other mineral. [pseudo- + G. morphe, form]

pseudomycelium (soo′do-mi-se′le-um)
A mycelium-like mass of pseudohyphae.

pseudomyopia (soo′do-mi-o′pe-a)
A condition simulating myopia and due to spasm of the ciliary muscle.

pseudomyxoma (soo′do-mik-so′ma)
A gelatinous mass resembling a myxoma but composed of mucus. p. peritonei the accumulation of large quantities of mucinous material in the peritoneal cavity, as a result of malignant cystic neoplasms of the ovary or appendix; it will frequently persist because of the growth of mucus-secreting cells scattered on serosal surfaces. SYN: gelatinous ascites.

pseudonarcotic (soo′do-nar-kot′ik)
Inducing sleep by reason of a sedative effect, but not directly narcotic.

pseudoneoplasm (soo-do-ne′o-plazm)
SYN: pseudotumor.

pseudoneuroma (soo′do-noo-ro′ma)
SYN: traumatic neuroma.

pseudonit (soo′do-nit)
SYN: hair cast.

pseudo-osteomalacia (soo′do-os′te-o-ma-la′she-a)
Rachitic softening of bone.

pseudo-osteomalacic (soo′do-os′te-o-ma-la′sik)
Marked by pseudo-osteomalacia.

pseudopapilledema (soo′do-pap-il-e-de′ma)
Anomalous elevation of the optic disk; seen in severe hyperopia and optic nerve drusen.

pseudoparalysis (soo′do-pa-ral′i-sis)
Apparent paralysis due to voluntary inhibition of motion because of pain, incoordination, or other cause, but without actual paralysis. SYN: pseudoparesis (1) . arthritic general p. a disease, occurring in arthritic subjects, having symptoms resembling those of general paresis, the lesions of which consist of diffuse changes of a degenerative and noninflammatory character due to intracranial atheroma. congenital atonic p. SYN: amyotonia congenita.

pseudoparaplegia (soo′do-par-a-ple′je-a)
Apparent paralysis in the lower extremities, in which the tendon and skin reflexes and the electrical reactions are normal; the condition is sometimes observed in rickets. Basedow p. weakness of the thigh muscles in thyrotoxicosis; may occur suddenly and cause the patient to fall.

pseudoparasite (soo-do-par′a-sit)
A false parasite; may be either a commensal or a temporary parasite (the latter being an organism accidentally ingested and surviving briefly in the intestine).

pseudoparenchyma (soo′do-pa-reng′ki-ma)
In fungi, a tissue-like mass of modified hyphae.

pseudoparesis (soo′do-pa-re′sis, -par′e-sis)
1. SYN: pseudoparalysis. 2. A condition marked by the pupillary changes, tremors, and speech disturbances suggestive of early paretic neurosyphilis, in which, however, the serologic test results are negative.

pseudopelade (soo′do-pe-lahd′)
A scarring type of alopecia; usually occurs in scattered irregular patches; of uncertain cause. SYN: p. of Brocq. [pseudo- + Fr. pelade, disease that causes sporadic falling of hair] p. of Brocq SYN: p..

pseudopericarditis (soo′do-per-i-kar-di′tis)
An artifact of auscultation resembling a friction rub, but due to movement of the tissue in the intercostal space when the diaphragm of the stethoscope is placed over the apex beat.

pseudoperoxidase (soo′do-per-oks-i-das)
Referring to the nonenzymatic, heat-stable peroxidase activity associated with hemeproteins.

pseudophacos (soo′do-fak′os)
SYN: lenticulus. [pseudo- + G. phakos, lens]

pseudophakia (soo-do-fak′e-a)
An eye in which the natural lens is replaced with an intraocular lens. [pseudo- + phakos, lentil (lens)]

pseudophakodonesis (soo-do-fa′ko-do-ne′sis)
Excessive mobility of an intraocular lens implant.

pseudophotesthesia (soo′do-fo-tes-the′ze-a)
SYN: photism. [pseudo- + G. phos, light, + aisthesis, sensation]

pseudophyllid (soo-do-fi′lid)
Common name for members of the order Pseudophyllidea.

Pseudophyllidea (soo′do-fi-lid′e-a)
An order of tapeworms with an aquatic life cycle, passing through coracidium, procercoid, and plerocercoid stages before developing into adults in fish, marine mammals, or fish-eating mammals; includes the broad fish tapeworm of humans, Diphyllobothrium latum. [pseudo- + G. phyllon, leaf]

pseudoplatelet (soo-do-plat′let)
Any of the fragments of neutrophils that may be mistaken for platelets, especially in peripheral blood smears of leukemic patients.

pseudopocket (soo′do-pok′et)
A pocket, adjacent to a tooth, resulting from gingival hyperplasia and edema but without apical migration of the epithelial attachment.

pseudopod (soo′do-pod)
SYN: pseudopodium.

pseudopodium, pl .pseudopodia (soo-do-po′de-um, -po′-de-a)
A temporary protoplasmic process, put forth by an ameboid stage or amebic protozoan for locomotion or for prehension of food. SYN: pseudopod. [pseudo- + G. pous, foot]

pseudopolydystrophy (soo′do-pol-e-dis′tro-fe)
SYN: mucolipidosis III.

pseudopolyp (soo-do-pol′ip)
A projecting mass of granulation tissue, large numbers of which may develop in ulcerative colitis; may become covered by regenerating epithelium. SYN: inflammatory polyp.

pseudoporphyria (soo′do-por-fir′e-a)
A condition clinically identical to porphyria but with no abnormality in porphyrin excretion, consequent to drug ingestion or hemodialysis.

pseudopregnancy (soo-do-preg′nan-se)
1. SYN: false pregnancy. 2. A condition in which symptoms resembling those of pregnancy are present, but which is not pregnancy; occurs after sterile copulation in mammalian species in which copulation induces ovulation, and also in dogs, in which the estrous cycle includes a marked luteal phase.

pseudoprognathism (soo-do-prog′na-thizm)
An acquired projection of the mandible due to occlusal disharmonies that force the mandible forward; the mandibular condyles are forward of their expected functional position.

pseudopterygium (soo′do-te-rij′e-um)
Adhesion of the conjunctiva to the cornea, occurring after injury.

pseudoptosis (soo-do-to′sis, soo-dop′to-sis)
A condition resembling an inability to elevate the eyelid, due to blepharophimosis, blepharochalasis, or some other affection. SYN: false blepharoptosis. [pseudo- + G. ptosis, a falling]

pseudopuberty (soo-do-pu′ber-te)
Condition characterized by the precocious development of a varying number of the somatic and functional changes typical of puberty; commonly caused by the hormonal secretions of an ovarian tumor (especially ovarian or testicular) and typically arises before the chronologic age of puberty. It does not represent the normal pubertal sequence intiated with hypothalamic-pituitary gonadotropins. precocious p. the development of p. in very young children; commonly characterized by secretion of gonadal hormones, without stimulation of gametogenesis.

pseudoreaction (soo′do-re-ak′shun)
A false reaction; one not due to specific causes in a given test.

pseudoreplica (soo-do-rep′li-ka)
A specimen for electron microscopic examination obtained by depositing particles from a virus-containing suspension on an agarose surface, covering the surface with a plastic-containing solution, and, after evaporation of the solvent, removing the film along with enmeshed particles by floating it onto the surface of a uranyl acetate solution.

pseudoretinitis pigmentosa (soo′do-ret-i-ni′tis pig-men-to′sa)
A widespread pigmentary mottling of the retina that may follow severe eye trauma, especially from a penetrating injury.

pseudorheumatism (soo-do-roo′ma-tizm)
1. Joint or muscle symptoms without objective findings and with no apparent underlying causes. 2. Feigned joint symptoms (obsolete).

pseudorickets (soo-do-rik′ets)
SYN: renal rickets.

pseudorosette (soo′do-ro-zet′)
Perivascular radial arrangement of neoplastic cells around a small blood vessel. See rosette (2) .

pseudorubella (soo′do-roo-bel′a)
SYN: exanthema subitum.

pseudosarcoma (soo-do-sar-ko′ma)
A bulky polyploid malignant tumor of the esophagus, composed of spindle cells with a focus of squamous cell carcinoma; spindle cells may be epithelial or metaplastic malignant fibroblasts.

pseudoscarlatina (soo′do-skar-la-te′na)
Erythema with fever, due to causes other than Streptococcus pyogenes.

pseudosclerosis (soo′do-skler-o′sis)
Inflammatory induration or fatty or other infiltration simulating fibrous thickening. [pseudo- + G. sklerosis, hardening]

pseudoseizure (soo′do-se′zher)
A psychogenic seizure.

pseudosmallpox (soo-do-smawl′poks)
SYN: alastrim.

pseudosmia (soo-doz′me-a)
Subjective sensation of an odor that is not present. [pseudo- + G. osme, smell]

Pseudostertagia bullosa (soo′do-ster-ta′je-a bul-o′sa)
One of the medium stomach worms located in the abomasum of sheep, goats, and pronghorn; it is found chiefly in the western U.S.

pseudostoma (soo-dos′to-ma)
An apparent opening in a cell, membrane, or other tissue, due to a defect in staining or other cause. [pseudo- + G. stoma, mouth]

pseudostrabismus (soo′do-stra-biz′mus)
The appearance of strabismus caused by epicanthus, abnormality in interorbital distance, or corneal light reflex not corresponding to the center of the pupil. [pseudo- + G. strabismos, a squinting]

pseudotabes (soo-do-ta′bez)
A syndrome having the characteristics of tabetic neurosyphilis but not due to syphilis. SYN: Leyden ataxia. pupillotonic p. SYN: Adie syndrome.

pseudotruncus arteriosus (soo-do-trung′kus ar-ter-e-o′sus)
Congenital cardiovascular malformation with atresia of the pulmonic valve and absence of the main pulmonary artery; the lungs are supplied with blood either through a patent ductus or via bronchial arteries arising from the aorta; a characteristic of the most severe form of tetralogy of Fallot.

pseudotubercle (soo-do-too′ber-kl)
A nodule histologically similar to a tuberculous granuloma, but due to infection by some microorganism other than Mycobacterium tuberculosis.

pseudotuberculosis (soo′do-too-ber′ku-lo′sis)
A disease of a wide variety of animal species caused by the bacterium Yersinia p.. Epizootics of p. are commonly seen in birds and rodents, often with high case fatality rates. In humans, seven clinical entities are recognized: primary focalized infections (pseudoappendicitis, acute mesenteric lymphadenitis, or acute terminal ileitis), primary generalized infections (septicemia or scarlatiniform fever), and secondary immunologic phenomena (erythema nodosum or arthralgia). SYN: pseudotubercular yersiniosis.

pseudotumor (soo′do-too-mer)
An enlargement of nonneoplastic character that clinically resembles a true neoplasm so closely as to often be mistaken for such. SYN: pseudoneoplasm. p. cerebri a disorder, commonly associated with obesity in young females, consisting of cerebral edema with narrowed small ventricles but with increased intracranial pressure and, frequently, papilledema. inflammatory p. a tumor-like mass in the lungs or other sites, composed of fibrous or granulation tissue infiltrated by inflammatory cells.

pseudounimolecular (soo′do-oo-ne-mo-lek-oo-lar)
Referring to a reaction whose rate appears to be dependent on the concentration of only one substrate; usually due to a constant, saturating level of the other compounds. SYN: pseudomonomolecular.

pseudouridine (Ψ, Q) (soo-do-u′ri-den, -din)
5-β-d-Ribosyluracil;a naturally occurring isomer of uridine found in transfer ribonucleic acids; unique in that the ribosyl is attached to carbon (C-5) rather than to nitrogen; excreted in urine.

pseudovacuole (soo-do-vak′u-ol)
An apparent vacuole in a cell, either an artifact or an intracellular parasite.

pseudovariola (soo′do-va-ri′o-la)
SYN: alastrim. [pseudo- + L. variola, smallpox]

pseudoventricle (soo-do-ven′tri-kl)
SYN: cavity of septum pellucidum.

pseudovitamin (soo-do-vi′ta-min)
A substance having a chemical structure very similar to that of a given vitamin, but lacking the usual physiologic action. p. B12 cobamide cyanide phosphate, 3′-ester with 7-α-d-ribofuranosyladenine, inner salt; vitamin B12 with adenine replacing dimethylbenzimidazole; one of several substances produced during anaerobic fermentation by certain organisms in bovine rumen contents; it is chemically closely similar to vitamin B12 (cyanocobalamin) but without, in humans, the physiologic action of the vitamin.


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