| hartmannella | A genus of free-living amoebae found in fresh water. The cysts usually pass harmlessly through the intestinal tract of man and may thus be found in feces. Occasionally, these organisms cause respiratory tract infections or generalised fatal meningoencephalitis. (12 Dec 1998) |
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| Hartnup | Surname of British family in which the disease was first described. See: Hartnup disease, syndrome. (05 Mar 2000) |
| Hartnup disease | <biochemistry> Amino acid transport defect that leads to excessive loss of monoamino monocarboxylic acids (cystine, lysine, ornithine, arginine) in the urine and poor absorption in the gut. See: iminoglycinuria. (18 Nov 1997) |
| Hartnup disorder | <biochemistry> Amino acid transport defect that leads to excessive loss of monoamino monocarboxylic acids (cystine, lysine, ornithine, arginine) in the urine and poor absorption in the gut. See: iminoglycinuria. (18 Nov 1997) |
| Hartnup syndrome | <biochemistry> Amino acid transport defect that leads to excessive loss of monoamino monocarboxylic acids (cystine, lysine, ornithine, arginine) in the urine and poor absorption in the gut. See: iminoglycinuria. (18 Nov 1997) |
| Hartree-Fock approximation | <radiobiology> A refinement of the Hartree method in which one uses determinants of single-particle wave functions rather than products, thereby introducing exchange terms into the Hamiltonian. (06 Mar 1998) |
| harts clover | <botany> Melilot or sweet clover. (06 Mar 1998) |
| hartshorn | 1. <zoology> The horn or antler of the hart, or male red deer. 2. <alchemy> Spirits of hartshorn; volatile salts. Hartshorn plantain, a solution of ammonia in water; so called because formerly obtained from hartshorn shavings by destructive distillation. Similar ammoniacal solutions from other sources have received the same name. (06 Mar 1998) |
| hartwort | <botany> A coarse umbelliferous plant of Europe (Tordylium maximum). The name is often vaguely given to other plants of the same order, as species of Seseli and Bupleurum. Source: Websters Dictionary (01 Mar 1998) |