| MacNeal, Ward | <person> U.S. Bacteriologist, 1881-1946. See: MacNeal's tetrachrome blood stain, Novy and MacNeal's blood agar. (05 Mar 2000) |
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| Macracanthorhynchus | A genus of giant thorny-headed worms (class Acanthocephala). Origin: macro-+ G. Akantha, thorn, + rhynchos, snout (05 Mar 2000) |
| Macracanthorhynchus hirudinaceus | The giant thorny-headed worm of the pig, approximately the size of the giant roundworm (Ascaris); it inhabits the intestinal tract where nodules develop at the site of penetration of the spiny proboscis of each worm; it has occasionally been reported in man; transmission is by ingestion of infected insects, frequently dung beetles or cockroaches that have fed on faeces of infected pigs containing viable eggs and have developed the cystacanth stage infective to the vertebrate host, including humans. (05 Mar 2000) |
| macrencephalic | Having a large brain. Origin: Macro + encephalic, encephalous. Source: Websters Dictionary (01 Mar 1998) |
| macrencephalous | Having a large brain. Origin: Macro + encephalic, encephalous. Source: Websters Dictionary (01 Mar 1998) |
| macrencephaly | Macrencephalia Hypertrophy of the brain; the condition of having a large brain. Origin: macro-+ G. Enkephalos, brain (05 Mar 2000) |
| macro- | <prefix> Prefix from the Greek makros meaning large or long. The opposite of micro-. (12 Dec 1998) |
| macro-Kjeldahl method | A procedure for analyzing the content of nitrogenous compounds in urine, serum, or other specimens, usually to determine relatively large amounts of nitrogen (e.g., 20 to 100 mg); the specimen is treated with a digestion mixture (copper sulfate and sulfuric acid), heated thoroughly, and made alkaline with a solution of sodium hydroxide; ammonia is then distilled from the mixture, trapped in a boric acid-indicator solution, and titrated with standard hydrochloric or sulfuric acid. (05 Mar 2000) |
| macroadenoma | <tumour> A pituitary adenoma larger than 10 mm in diameter. (05 Mar 2000) |
| macroaggregated albumin | A conglomerate of human serum albumin in a suspension; usually refers to particles 10 to 50 um in size; used as a tagged agent for lung scanning. (05 Mar 2000) |
| macroalgae | Multicellular algae (green, blue-green and red algae) having filamentous, sheet or mat-like morphology. (09 Oct 1997) |
| macroamylasaemia | A form of hyperamylasaemia, in which a portion of serum amylase exists as macroamylase. Origin: macroamylase + G. Haima, blood (05 Mar 2000) |
| macroamylase | <enzyme> Abnormally large serum amylase bound to globulin; causes macroamylasaemia Registry number: EC 3.2.1.- (26 Jun 1999) |
| macrobacterium | A bacterium of unusually large size. Synonym: macrobacterium. (05 Mar 2000) |
| macrobenthos | Organisms (for example, insect larvae) living in or on aquatic substrates and large enough to be seen with the naked eye. (09 Oct 1997) |