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Medical Dictionary - Dictionary of Medicine and Human Biology

Medical Dictionary


myricin (mir′i-sin)
Myricyl palmitate, a white, almost odorless solid that is the chief constituent of beeswax.

See myringo-.

myringa (mi-ring′ga)
SYN: tympanic membrane. [Mod. L. drum membrane]

myringectomy (mir-in-jek′to-me)
Excision of the tympanic membrane. [myring- + G. ektome, excision]

myringitis (mir-in-ji′tis)
Inflammation of the tympanic membrane. SYN: tympanitis. [myring- + G. -itis, inflammation] m. bulbosa SYN: myringodermatitis. bullous m. painful inflammation of the tympanic membrane accompanied by bullae.

myringo-, myring-
The membrana tympani. [Mod. L. myringa]

myringodermatitis (mi-ring′go-der-ma-ti′tis)
Inflammation of the meatal or outer surface of the drum membrane and the adjoining skin of the external auditory canal. SYN: myringitis bulbosa.

myringoplasty (mi-ring′go-plas′te)
Operative repair of a damaged tympanic membrane. [myringo- + G. plasso, to form]

myringosclerosis (mi-ring′go-skler-o′sis)
Formation of dense connective tissue in the tympanic membrane, usually not associated with hearing loss. [myringo- + sclerosis]

myringostapediopexy (mi-ring′go-sta-pe′de-o-pek′se)
A technique of tympanoplasty in which the tympanic membrane or grafted tympanic membrane is brought into functional connection with the stapes. [myringo- + L. stapes, stirrup (stapes), + G. pexis, fixation]

myringotome (mi-ring′go-tom)
A knife used for paracentesis of the tympanic cavity. [myringo- + G. tome, excision]

myringotomy (mir-ing-got′o-me)
Incision of the tympanic membrane. SYN: tympanotomy. [myringo- + G. tome, excision]

myrinx (mi′ringks, mir′ringks)
SYN: tympanic membrane. [Mod. L. myringa, drum membrane]

myristica (mi-ris′ti-ka)
SYN: nutmeg. [G. myrizo, to anoint, fr. myron, an unguent] m. oil SYN: nutmeg oil.

myristic acid (mi-ris′tik)
A saturated fatty acid present as an acylglycerol in milk, vegetable fats, cod liver oil, and waxes. SYN: tetradecanoic acid.

myristicin (mi-ris′ti-sin)
A constituent of nutmeg thought to be responsible, at least in part, for the bizarre central nervous system symptoms produced by the ingestion of large amounts of nutmeg.

myristoleic acid (mi-ris-to-le′ik)
A 14-carbon unsaturated fatty acid with a double bond between carbons 9 and 10; the 14-carbon analog of oleic acid.

myrmecia (mir-me′she-a)
A form of viral wart in which the lesion has a domed surface ( i.e., an ant hill configuration) and is associated with pale staining intranuclear and amphophilic intracytoplasmic inclusion bodies in the epidermal cells. [G. murmex, ant]

myrosinase (mi-ro′si-nas)
SYN: thioglucosidase.

myrrh (mer)
A gum resin from Commiphora molmol and C. abyssinica (family Burseraceae) and other species of C., a shrub of Arabia and eastern Africa; used as an astringent, tonic, and stimulant, and locally for diseases of the oral cavity and in mouthwashes; thought to have been used in ancient Egyptian medicine and embalming. [G. myrrha]

mysophilia (mi-so-fil′e-a)
SYN: coprophilia (2) . [G. mysos, defilement, + philos, fond]

mysophobia (mi-so-fo′be-a)
Morbid fear of dirt or defilement from touching familiar objects. SYN: rhypophobia. [G. mysos, defilement, + phobos, fear]

mytacism (mi′ta-sizm)
A form of stammering in which the letter m is frequently substituted for other consonants. SYN: mutacism. [G. my, the letter μ]

myurous (mi-u′rus)
Gradually decreasing in thickness, as a mouse's tail; rarely used term denoting certain symptoms in process of cessation, or the heartbeat in certain cases in which it grows feebler and feebler for a while and then strengthens. [G. mys, mouse, + ouros, tail]

myxadenitis labialis
SYN: cheilitis glandularis.

myxasthenia (mik-sas-the′ne-a)
Faulty secretion of mucus. [myx- + G. astheneia, weakness]

myxedema (mik-se-de′ma)
Hypothyroidism characterized by a relatively hard edema of subcutaneous tissue, with increased content of mucins (proteoglycans) in the fluid; characterized by somnolence, slow mentation, dryness and loss of hair, increased fluid in body cavities such as the pericardial sac, subnormal temperature, hoarseness, muscle weakness, and slow return of a muscle to the neutral position after a tendon jerk; usually caused by removal or loss of functioning thyroid tissue. [myx- + G. oidema, swelling] congenital m. SYN: infantile hypothyroidism. infantile m. SYN: infantile hypothyroidism. operative m. m. developing after thyroidectomy. pituitary m. m. resulting from inadequate secretion of the thyrotropic hormone; commonly occurs in association with inadequate secretion of other anterior pituitary hormones.

myxedematoid (mik-se-dem′a-toyd)
Resembling myxedema.

myxedematous (mik-se-dem′a-tus)
Relating to myxedema.

myxemia (mik-se′me-a)
SYN: mucinemia. [myx- + G. haima, blood]

myxo-, myx-
Mucus. SEE ALSO: muci-, muco-. [G. myxa, mucus]

myxochondrofibrosarcoma (mik′so-kon′dro-fi′bro-sar-ko′ma)
A malignant neoplasm derived from fibrous connective tissue, i.e., a fibrosarcoma, in which there are intimately associated foci of cartilaginous and myxomatous tissue. [myxo- + G. chondros, cartilage, + L. fibra, fiber, + G. sarx, flesh, + -oma, tumor]

myxochondroma (mik′so-kon-dro′ma)
A benign neoplasm of cartilaginous tissue, i.e., a chondroma, in which the stroma resembles relatively primitive mesenchymal tissue. SYN: myxoma enchondromatosum. [myxo- + G. chondros, cartilage, + -oma, tumor]

Myxococcidium stegomyiae (mik′so-kok-sid′e-um steg-o-mi′e-e)
A protozoon once found in the body of the mosquito, Stegomyia calopus, that had fed on the blood of a patient with yellow fever; the organism was then postulated, incorrectly, to be the causal agent of yellow fever.

myxocyte (mik′so-sit)
One of the stellate or polyhedral cells present in mucous tissue. [myxo- + G. kytos, cell]

myxofibroma (mik′so-fi-bro′ma)
A benign neoplasm of fibrous connective tissue that resembles primitive mesenchymal tissue. SYN: fibroma myxomatodes, myxoma fibrosum. [myxo- + L. fibra, fiber, + G. -oma, tumor]

myxofibrosarcoma (mik′so-fi′bro-sar-ko′ma)
A malignant fibrous histiocytoma with a predominance of myxoid areas that resemble primitive mesenchymal tissue. [myxo- + L. fibra, fiber, + G. sarx, flesh, + -oma, tumor]

myxoid (mik′soyd)
Resembling mucus. [myxo- + G. eidos, resemblance]

myxolipoma (mik′so-li-po′ma)
A benign neoplasm of adipose tissue in which portions of the tumor resemble mucoid mesenchymal tissue. SYN: lipoma myxomatodes, myxoma lipomatosum. [myxo- + G. lipos, fat, + -oma, tumor]

myxoma (mik-so′ma)
A benign neoplasm derived from connective tissue, consisting chiefly of polyhedral and stellate cells that are loosely embedded in a soft mucoid matrix, thereby resembling primitive mesenchymal tissue; occurs frequently intramuscularly (where it may be mistaken for a sarcoma), also in the jaw bones, and encysted in the skin (focal mucinosis and dorsal wrist ganglion). [myxo- + G. -oma, tumor] atrial m. a primary cardiac neoplasm arising most commonly in the left atrium as a soft polypoid mass attached by a stalk to the atrial septum; it may resemble an organized mural thrombus, and the symptoms may include cardiac murmurs, which change with alteration of body position and signs of mitral stenosis or insufficiency, with continuous danger of embolism by fragments of the tumor or its entire mass. m. enchondromatosum SYN: myxochondroma. m. fibrosum SYN: myxofibroma. m. lipomatosum SYN: myxolipoma. odontogenic m. a benign, expansile, multilocular radiolucent neoplasm of the jaws consisting of myxomatous fibrous connective tissue; presumably derived from the mesenchymal components of the odontogenic apparatus. m. sarcomatosum SYN: myxosarcoma.

myxomatosis (mik′so-ma-to′sis)
1. SYN: mucoid degeneration. 2. Multiple myxomas.

myxomatous (mik-so′ma-tus)
1. Pertaining to or characterized by the features of a myxoma. 2. Said of tissue that resembles primitive mesenchymal tissue.

myxomycete (mik′so-mi-set)
A member of the class Myxomycetes.

Myxomycetes (mik′so-mi-se′tez)
A class of fungi containing the slime molds, which occur on rotting vegetation but are not pathogenic for humans. [myxo- + G. mykes, fungus]

myxoneuroma (mik′so-noo-ro′ma)
1. Obsolete term for a tumefaction resulting from abnormal proliferation of Schwann cells, in which focal or diffuse degenerative changes result in portions that resemble primitive mesenchymal tissue. 2. Obsolete term for a neurilemoma, meningioma, or glioma in which the stroma is myxomatous in nature. [myxo- + G. neuron, nerve, + -oma, tumor]

myxopapilloma (mik′so-pap-i-lo′ma)
A benign neoplasm of epithelial tissue in which the stroma resembles primitive mesenchymal tissue. [myxo- + L. papilla, a nipple, + G. -oma, tumor]

myxopoiesis (mik′so-poy-e′sis)
Mucus production. [myxo- + G. poiesis, a making]

myxorrhea gastrica
SYN: gastromyxorrhea.

myxosarcoma (mik′so-sar-ko′ma)
A sarcoma, usually a liposarcoma or malignant fibrous histiocytoma, with an abundant component of myxoid tissue resembling primitive mesenchyme containing connective tissue mucin. SYN: myxoma sarcomatosum. [myxo- + G. sarx, flesh, + -oma, tumor]

Myxospora (mik-so-spo′ra)
A subphylum of the phylum Protozoa, characterized by the presence of spores of multicellular origin, usually with two or three valves, two or more polar filaments, and an ameboid sporoplasm; parasitic in lower vertebrates, especially common in fishes. Important genera include Ceratomyxa, Hanneguya, Leptotheca, Myxidium, and Myxobolus. [myxo- + G. sporos, seed]

Myxosporea (mik′so-spo-re′a)
A class of Myxozoa with spores containing one to six (usually two) polar capsules, each containing a coiled polar filament; parasitic in the celom or tissues of cold-blooded vertebrates, especially fishes. Important genera include Ceratomyxa, Hanneguya, Leptotheca, Myxidium, and Myxobolus.

myxovirus (mik′so-vi′rus)
Term formerly used for viruses with an affinity for mucins, now included in the families Orthomyxoviridae and Paramyxoviridae. The myxoviruses included influenza virus, parainfluenza virus, respiratory syncytial virus, measles virus, and mumps virus.

Myxozoa (mik-so-zo′a)
A phylum of the subkingdom Protozoa, characterized by spores of multicellular origin (usually with two or three valves), one to six polar capsules or nematocysts (each with a coiled hollow filament), and a one- to many-nucleated ameboid sporoplasm; parasitic in annelids and other invertebrates (class Actinosporea; subclass Actinomyxa) and in lower vertebrates (class Myxosporea). [myxo- + G. zoon, animal]

meta-rhodopsin I, meta-rhodopsin II, meta-rhodopsin III
Precursors of opsin and all-trans-retinal, formed from lumirhodopsin in the visual cycle.

Abbreviation for strontium-87m.

Symbol for technetium-99m.

99mTc-dimercaptosuccinic acid
Radiopharmaceutical that localizes to the renal cortex for imaging to determine scarring or pyelonephritis.

Abbreviation for 99mTc-dimercaptosuccinic acid.

Radiopharmaceutical possessing renal cortical-localizing and excretion-handling properties; may be used either for renal cortical imaging to determine scarring or for renal function imaging by renography.


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