hydroelectric bath |
A bath in which the medium is charged with electricity. Synonym: hydroelectric bath. Therapeutic application of static electricity, with the patient placed on an insulated platform. (05 Mar 2000) |
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hydroelectric power |
The generation of electricity using falling water. (05 Dec 1998) |
hydroencephalocele |
Protrusion, through a cleft in the skull, of brain substance expanded into a sac containing fluid. Synonym: encephalocystocele, hydrocephalocele, hydroencephalocele. Origin: hydr-+ G. Enkephalos, brain, + kele, tumour (05 Mar 2000) |
hydroferricyanic |
<chemistry> Pertaining to, or containing, or obtained from, hydrogen, ferric iron, and cyanogen; as, hydroferricyanic acid. See Ferricyanic. Origin: Hydro-, 2 + ferricyanic. Source: Websters Dictionary (01 Mar 1998) |
hydroferrocyanic |
<chemistry> Pertaining to, or containing, or obtained from, hydrogen, ferrous iron, and cyanogen; as, hydroferrocyanic acid. See Ferrocyanic. Origin: Hydro-, 2 + ferrocyanic. Source: Websters Dictionary (01 Mar 1998) |
hydrofluate |
<chemistry> A supposed compound of hydrofluoris acid and a base; a fluoride. Source: Websters Dictionary (01 Mar 1998) |
hydroflumethiazide |
<chemical> A thiazide diuretic with actions and uses similar to those of hydrochlorothiazide. Pharmacological action: antihypertensive agents, diuretics, thiazide. Chemical name: 2H-1,2,4-Benzothiadiazine-7-sulfonamide, 3,4-dihydro-6-(trifluoromethyl)-, 1,1-dioxide (12 Dec 1998) |
hydrofluoric |
<chemistry> Pertaining to, or containing, hydrogen and fluorine; fluohydric; as, hydrofluoric acid. <chemistry> Hydrofluoric acid, a colourless, mobile, volatile liquid, HF, very corrosive in its action, and having a strong, pungent, suffocating odour. It is produced by the action of sulphuric acid on fluorite, and is usually collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha. Origin: Hydro-, 2 + fluoric. Source: Websters Dictionary (01 Mar 1998) |
hydrofluoric acid |
<chemical> Hydrofluoric acid. A solution of hydrogen fluoride in water. It is a colourless fuming liquid which can cause painful burns. Chemical name: Hydrofluoric acid (12 Dec 1998) |
hydrofluosilicate |
<chemistry> A salt of hydrofluosilic acid; a silicofluoride. See Silicofluoride. Source: Websters Dictionary (01 Mar 1998) |
hydrofluosilicic |
<chemistry> Pertaining to, or denoting, a compound consisting of a double fluoride of hydrogen and silicon; silicofluoric. See Silicofluoric. Origin: Hydro-, 2 + fluorine + silicic. Source: Websters Dictionary (01 Mar 1998) |
hydrogalvanic |
Pertaining to, produced by, or consisting of, electricity evolved by the action or use of fluids; as, hydrogalvanic currents. Origin: Hydro-, 1 + galvanic. Source: Websters Dictionary (01 Mar 1998) |
hydrogel |
A colloid in which the particles are in the external or dispersion phase and water in the internal or dispersed phase. Compare: hydrosol. (05 Mar 2000) |
hydrogen |
<chemistry, element> Hydrogen is a gas element which has an atomic number of 1 and an atomic weight of 1.0079. It combines with oxygen to form water (H20) and is present in all organic compounds. A few types of bacteria can metabolise atmospheric hydrogen (H2). Hydrogen gas itself is not poisonous, but when it mixes with air it can easily ignite or explode. Hydrogen was discovered by Henry Cavendish in 1766 and was named by Lavoisier. There are two main isotopes of hydrogen: deuterium (2H) and tritium (3H, which is radioactive and is used in some glow-in-the-dark paints and as a tracer in biological studies). Abbreviation: H (09 Oct 1997) |
hydrogen acceptor |
A molecule that, in conjunction with a tissue enzyme system, carries hydrogen from one metabolite (oxidant) to another (reductant) or to molecular oxygen to form H2O. Synonym: hydrogen acceptor. (05 Mar 2000) |