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Medical Dictionary


pararhotacism (par′a-ro′ta-sizm)
Substitution of another sound for that of r. SEE ALSO: rhotacism. [para- + G. rho, letter r]

pararosanilin (par′a-ro-san′i-lin) [C.I. 42500]
A tri(aminophenyl)methane hydrochloride;an important red biologic stain used in Schiff reagent to detect cellular DNA (Feulgen stain), mucopolysaccharides (PAS stain), and proteins (ninhydrin-Schiff stain). SYN: parafuchsin.

pararrhythmia (par-a-ridh′me-a)
A cardiac dysrhythmia in which two independent rhythms coexist, but not as a result of A-V block; p. thus includes parasystole and A-V dissociation (2), but not complete A-V block. [para- + G. rhythmos, rhythm]

parasacral (par-a-sa′kral)
Alongside the sacrum.

parasalpingitis (par′a-sal-pin-ji′tis)
Inflammation of the tissues surrounding the fallopian or the eustachian tube. [para- + salpinx + G. -itis, inflammation]

Parascaris equorum (pa-ras′ka-ris e-kwo′rum)
A large, heavy-bodied ascarid nematode extremely common in the small intestine of horses and other equids. Larvae may develop in humans or mice, but do not reach the adult stage. SYN: Ascaris equorum.

parascarlatina (par′a-skar-la-te′na)
SYN: Filatov-Dukes disease.

parasexuality (par′a-sek-shu-al′i-te)
Abnormal or perverted sexuality.

parasigmatism (par-a-sig′ma-tizm)
SYN: lisping. [para- + G. sigma, the letter s]

parasinoidal (par′a-si-noy′dal)
Near a sinus, particularly a cerebral sinus.

parasite (par′a-sit)
1. An organism that lives on or in another and draws its nourishment therefrom. 2. In the case of a fetal inclusion or conjoined twins, the usually incomplete twin that derives its support from the more nearly normal autosite. [G. parasitos, a guest, fr. para, beside, + sitos, food] accidental p. SYN: incidental p.. autistic p. a p. descended from the tissues of the host. SYN: autochthonous p.. autochthonous p. SYN: autistic p.. commensal p. commensal (2) . euroxenous p. a p. with a broad or nonspecific host range. facultative p. an organism that may either lead an independent existence or live as a p., in contrast to obligate p.. heterogenetic p. a p. whose life cycle involves an alternation of generations. heteroxenous p. a p. that has more than one obligatory host in its life cycle. incidental p. a p. that normally lives on a host other than its normal host. SYN: accidental p.. inquiline p. inquiline. malignant tertian malarial p. SYN: Plasmodium falciparum. obligate p. a p. that cannot lead an independent nonparasitic existence, in contrast to facultative p.. quartan p. SYN: Plasmodium malariae. specific p. a p. that habitually lives in its present host and is particularly adapted for the host species. spurious p. organisms that parasitize other hosts that pass through the human intestine and are detected in the stool after ingestion ( e.g., Capillaria sp. eggs in animal liver). stenoxous p. a p. with a narrow or specific host range. temporary p. an organism accidentally ingested that survives briefly in the intestine. tertian p. SYN: Plasmodium vivax.

parasitemia (par′a-si-te′me-a)
The presence of parasites in the circulating blood; used especially with reference to malarial and other protozoan forms, and microfilariae.

parasitic (par-a-sit′ik)
1. Relating to or of the nature of a parasite. 2. Denoting organisms that normally grow only in or on the living body of a host.

parasiticidal (par′a-sit-i-si′dal)
Destructive to parasites.

parasiticide (par-a-sit′i-sid)
An agent that destroys parasites. [parasite + L. caedo, to kill]

parasitism (par′a-si-tizm)
A symbiotic relationship in which one species (the parasite) benefits at the expense of the other (the host). Cf.:mutualism, commensalism, symbiosis, metabiosis. multiple p. a condition in which parasites of different species parasitize a single host, in contrast to superparasitism (2) or hyperparasitism.

parasitize (par′a-si-tiz)
To invade as a parasite.

parasitocenose (par-a-si′to-se-noz)
Complex of all parasite species and individuals associated with a specific host. SYN: parasite-host ecosystem. [parasite + G. koinos, common, together]

parasitogenesis (par′a-si-to-jen′e-sis)
The evolution of relationships between parasite and host.

parasitogenic (par′-a-si-to-jen′ik)
1. Caused by certain parasites. 2. Favoring parasitism. [parasite + G. -gen, producing]

parasitoid (par-a-si′toyd)
Denoting a feeding relationship intermediate between predation and parasitism, in which the p. eventually destroys its host; refers especially to parasitic wasps (order Hymenoptera) whose larvae feed on and finally destroy a grub or other arthropod host stung by the mother wasp prior to laying its egg(s) on the host. [parasite + G. eidos, appearance]

parasitologist (par′a-si-tol′o-jist)
One who specializes in the science of parasitology.

parasitology (par′a-si-tol′o-je)
The branch of biology and of medicine concerned with all aspects of parasitism. [parasite + G. logos, study]

parasitome (par′a-si-tom)
The total mass or number of individuals of all developmental stages of a single parasite species in one host. [parasite + -ome (fr. G. -oma), group, mass]

parasitophobia (par′a-si-to-fo′be-a)
Morbid fear of parasites. [parasite + G. phobos, fear]

parasitosis (par′a-si-to′sis)
Infestation or infection with parasites.

parasitotropic (par′a-si-to-trop′ik)
Pertaining to or characterized by parasitotropism.

parasitotropism (par′a-si-tot′ro-pizm)
The special affinity of particular drugs or other agents for parasites rather than for their hosts, including microparasites that infect a larger parasite. Cf.:organotropism. SYN: parasitotropy. [parasite + G. trope, a turning]

parasitotropy (par′a-si-tot′ro-pe)
SYN: parasitotropism.

parasomnia (par-a-som′ne-a)
Any dysfunction associated with sleep, e.g., somnabulism, pavor nocturnus, enureseis, or nocturnal seizures.

parastasis (par-a-sta′sis)
A reciprocal relationship among causal mechanisms that can compensate for, or mask defects in, each other; in genetics, a relationship between nonalleles (classified by some as a form of epistasis). [G. standing shoulder to shoulder]

parasternal (par-a-ster′nal)
Alongside the sternum.

Parastrongylus (par′a-stron′ji-lus)
SYN: Angiostrongylus.

A narrow region of cortex located between the entorhinal area (or cortex) and the subiculum.

parasympathetic (par-a-sim-pa-thet′ik)
Pertaining to a division of the autonomic nervous system. See autonomic division of nervous system.

parasympatholytic (par-a-sim′pa-tho-lit′ik)
Relating to an agent that annuls or antagonizes the effects of the parasympathetic nervous system; e.g., atropine.

parasympathomimetic (par-a-sim′pa-tho-mi-met′ik)
Relating to drugs or chemicals having an action resembling that caused by stimulation of the parasympathetic nervous system. SEE ALSO: cholinomimetic. [para- + G. sympatheia, sympathy, + mimetikos, imitative]

parasympathotonia (par-a-sim′pa-tho-to′ne-a)
SYN: vagotonia.

parasynapsis (par′a-si-nap′sis)
Union of chromosomes side to side in the process of reduction. [para- + G. synapsis, a connection, junction]

parasynovitis (par′a-si-no-vi′tis)
Inflammation of the tissues immediately adjacent to a joint. [para- + synovitis]

parasyphilis (par-a-sif′i-lis)
Any condition indirectly due to syphilis. SYN: metasyphilis (2) , parasyphilosis, quaternary syphilis.

parasyphilitic (par′a-sif-i-lit′ik)
Denoting certain diseases supposed to be indirectly due to syphilis but presenting none of the recognized lesions of that infection. SYN: metaluetic (3) . SYN: metasyphilitic (3) .

parasyphilosis (par′a-sif-i-lo′sis)
SYN: parasyphilis.

parasystole (par-a-sis′to-le)
A second automatic rhythm existing simultaneously with normal sinus or other dominant rhythm, the parasystolic center being protected from the dominant rhythm's impulses so that its basic rhythm is undisturbed, although it may be manifest in the ECG only at various multiples of its basic periodicity. SYN: parasystolic beat. [para- + G. systole, a contracting]

parataxia (par-a-tak′se-a)
SYN: parataxis.

parataxic (par-a-tak′sik)
Pertaining to parataxis.

parataxis (par-a-tak′sis)
An older term for the psychologic state or repository of attitudes, ideas, and experiences accumulated during personality development that are not effectively assimilated or integrated into the growing mass and residue of the other attitudes, ideas, and experiences of an individual's personality. SYN: parataxia. [para- + G. taxis, orderly arrangement]

paratenesis (par-a-te-ne′sis)
Passage of an infective agent by one or a series of paratenic hosts in which the agent is transported between hosts but does not undergo further development. [parasite + L. teneo, to hold, maintain]

paratenon (par-a-ten′on)
The tissue, fatty or synovial, between a tendon and its sheath. [para- + G. tenon, tendon]

paraterminal (par-a-ter′mi-nal)
Near or alongside any terminus.

parathion (par-a-thi′on)
An organic phosphate insecticide, highly toxic to animals and humans, that is an irreversible inhibitor of cholinesterases.

parathormone (par-a-thor′mon)
SYN: parathyroid hormone.

parathymia (par-a-thi′me-a)
Misdirection of the emotional faculties; disordered mood. [para- + G. thymos, soul, mind]

parathyrin (par-a-thi′rin)
SYN: parathyroid hormone.

parathyroid (par-a-thi′royd)
1. Adjacent to the thyroid gland. 2. SYN: p. gland.

parathyroidectomy (pa′ra-thi-roy-dek′to-me)
Excision of the parathyroid glands. [parathyroid + G. ektome, excision]

parathyrotropic, parathyrotrophic (par′a-thi-ro-trop′ik, -trof′ik)
Influencing the growth or activity of the parathyroid glands. [parathyroid + G. trope, a turning; trophe, nourishment]

paratope (par′a-top)
That part of an antibody molecule composed of the variable regions of both the light and heavy chains that combine with the antigen. SYN: antibody-combining site, antigen-binding site. [para- + -tope]

paratrichosis (par′a-tri-ko′sis)
Any disorder in the growth of the hair, with particular reference to quantity. [para- + G. trichosis, making or being hairy, fr. thrix (trich-), hair]

paratripsis (par-a-trip′sis)
Chafing. [G. friction, fr. para, beside, + tripsis, rubbing]

paratrophic (par-a-trof′ik)
Deriving sustenance from living organic material. SEE ALSO: metatrophic, prototrophic. [para- + G. trophe, nourishment]

paratyphlitis (par′a-tif-li′tis)
Inflammation of the connective tissue adjacent to the cecum. [para- + G. typhlon, cecum, + -itis, inflammation]

paratyphoid (par-a-ti′foyd)
SYN: p. fever.

paraumbilical (par′a-um-bil′i-kal)
Near the umbilicus. SYN: paraomphalic, parumbilical.

paraurethral (par′a-u-re′thral)
Alongside the urethra.

paravaccinia (par′a-vak-sin′e-a)
Former name for Pseudocowpox virus. SYN: milkers' nodules, under nodule.

paravaginal (par-a-vaj′i-nal)
Alongside the vagina.

paravaginitis (par′a-vaj-i-ni′tis)
Inflammation of the connective tissue alongside the vagina. SYN: paracolpitis.

paravalvular (par-a-val′vu-lar)
Alongside or in the vicinity of a valve.

paravenous (par′a-ve′nus)
Beside a vein.


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