| black vomit | <medicine> A copious vomiting of dark-coloured matter; or the substance so discharged; one of the most fatal symptoms in yellow fever. Source: Websters Dictionary (01 Mar 1998) |
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| black water | azoturia of horses |
| black widow spider | A venomous new world spider with an hourglass-shaped red mark on the abdomen. (12 Dec 1998) |
| black widow spider venom | Potent neurotoxin that induces catastrophic release of acetylcholine from presynaptic terminals of cholinergic chemical synapses. (18 Nov 1997) |
| Black's classification | A classification of cavities of the teeth based upon the tooth surface(s) involved. (05 Mar 2000) |
| Black's formula | A translation of Pignet's formula into British measurements: F = (W + C) -H; F is the empirical factor, W is the weight in pounds, C the chest girth in inches at full inspiration, and H the height in inches; a man is classed as very strong when F is over 120, strong between 110 and 120, good 100 to 110, fair 90 to 100, weak 80 to 90, very weak under 80. (05 Mar 2000) |
| Black, Douglas | <person> Scottish physician, *1909. See: Black's formula. (05 Mar 2000) |
| Black, Greene | <person> U.S. Dentist, 1836-1915. See: Black's classification. (05 Mar 2000) |
| black-dot ringworm | Tinea capitis due most commonly to Trichophyton tonsurans or T. Violaceum. (05 Mar 2000) |
| black-hearted | Having a wicked, malignant disposition; morally bad. Source: Websters Dictionary (01 Mar 1998) |
| black-jack | 1. <chemical> A name given by English miners to sphalerite, or zinc blende; called also false galena. See Blende. 2. Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc. 3. A large leather vessel for beer, etc. 4. <botany> The Quercus nigra, or barren oak. 5. The ensign of a pirate. Source: Websters Dictionary (01 Mar 1998) |
| black-tongue disease | A disease of dogs similar to human pellagra and due to niacin deficiency. (05 Mar 2000) |
| blackband | <chemical> An earthy carbonate of iron containing considerable carbonaceous matter; valuable as an iron ore. Source: Websters Dictionary (01 Mar 1998) |
| blackberry | The fruit of several species of bramble (Rubus); also, the plant itself. Rubus fruticosus is the blackberry of England; R. Villosus and R. Canadensis are the high blackberry and low blackberry of the United States. There are also other kinds. Origin: OE. Blakberye, AS. Blaecerie; blaec black + berie berry. Source: Websters Dictionary (01 Mar 1998) |
| blackbird | <zoology> In England, a species of thrush (Turdus merula), a singing bird with a fin note; the merle. In America the name is given to several birds, as the Quiscalus versicolour, or crow blackbird; the Agelaeus phoeniceus, or red-winged blackbird; the cowbird; the rusty grackle, etc. See Redwing. Source: Websters Dictionary (01 Mar 1998) |