| melastomaceous | <botany> Belonging to the order of which Melastoma is the type. Source: Websters Dictionary (01 Mar 1998) |
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| melatonin | <hormone> A hormone secreted by the pineal gland. In lower vertebrates causes aggregation of pigment in melanophores and thus lightens skin. In humans believed to play a role in establishment of circadian rhythms. (13 Nov 1997) |
| melatonin deacetylase | <enzyme> Enzyme from various vertebrate ocular tissues converts melatonin to 5-hydroxytryptamine Registry number: EC 3.5.1.- (26 Jun 1999) |
| melatope | <microscopy> The centre of rotation of the isogyres in biaxial interference figures representing the point of emergence of rays that, in the crystal, travel along the optic axes. (05 Aug 1998) |
| Melchior syndrome | <syndrome> An osteochondrodysplasia that clinically resembles Morquio's syndrome, but without excretion of mucopolysaccharides; characterised by mental retardation, short stature, progressive sternal bulging, flattening of vertebral bodies and iliac crests, shortening of metacarpals, and changes in long bones; autosomal recessive inheritance, but there is an X-linked form. Dyskinesia, clearance of mucus is sluggish and bronchiectasis is prevalent and intractable. There is evidence that the defect lies in dynein, a protein in the cilia. The pattern of inheritance is apparently autosomal recessive however multiple versions may exist. (05 Mar 2000) |
| meleagrine | <zoology> Of or pertaining to the genus Meleagris. Source: Websters Dictionary (01 Mar 1998) |
| meleagris | <ornithology> A genus of American gallinaceous birds, including the common and the wild turkeys. Origin: L, the Guinea fowl. Source: Websters Dictionary (01 Mar 1998) |
| melena | 1. <gastroenterology> The passage of dark, pitchy and grumous stools stained with blood pigments or with altered blood. 2. Black vomit. Origin: Gr. Melaina, feminine of Gr. Melas = black (18 Nov 1997) |
| melena neonatorum | <paediatrics> Melena of the newborn or melana occurring in young infants. (05 Mar 2000) |
| melena spuria | <paediatrics> Passage in the stool of blood that has been swallowed, especially that swallowed by nurslings from a fissured nipple. (05 Mar 2000) |
| melena vera | <gastroenterology> True melena as distinguished from melena spuria. (05 Mar 2000) |
| melene | <chemistry> An unsaturated hydrocarbon, C30H60, of the ethylene series, obtained from beeswax as a white, scaly, crystalline wax. Synonym: melissene, and melissylene. Origin: Melissic + ethylene. Source: Websters Dictionary (01 Mar 1998) |
| melenemesis | Vomiting of dark-coloured or blackish material. See: black vomit. Origin: G. Melas, black, + emesis, vomiting (05 Mar 2000) |
| Meleney's gangrene | Undermining ulcer of the skin and subcutaneous tissues, usually following an operation, caused by a synergistic interaction between microaerophilic nonhemolytic streptococci and aerobic haemolytic staphylococci. Synonym: Meleney's gangrene, progressive bacterial synergistic gangrene. (05 Mar 2000) |
| Meleney's ulcer | Undermining ulcer of the skin and subcutaneous tissues, usually following an operation, caused by a synergistic interaction between microaerophilic nonhemolytic streptococci and aerobic haemolytic staphylococci. Synonym: Meleney's gangrene, progressive bacterial synergistic gangrene. (05 Mar 2000) |