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hydrarthrus
<medicine> An effusion of watery liquid into the cavity of a joint.
Origin: NL. See Hydro-, 1, and Arthrosis.
Source: Websters Dictionary
(01 Mar 1998)
hydrase
Former name for hydratase.
(05 Mar 2000)
hydrastine
<chemistry> An alkaloid, found in the rootstock of the golden seal (Hydrastis Canadensis), and extracted as a bitter, white, crystalline substance. It is used as a tonic and febrifuge.
Source: Websters Dictionary
(01 Mar 1998)
hydrastinine
A semisynthetic alkaloid prepared from hydrastine; the hydrochloride has been used in uterine haemorrhage and as an oxytocic; in large doses, it is a powerful depressant of the entire motor tract (motor cortex, nerve, and muscle).
(05 Mar 2000)
hydrastis
The dried rhizome of Hydrastis canadensis (family Ranunculaceae), a native of the eastern U.S.; formerly used in the treatment of chronic catarrhal states of the mucous membranes and in metrorrhagia.
Synonym: golden seal, jaundice root, yellow root.
Origin: Mod. L. Fr. G. Hydor (hydro-), water, + drao, to accomplish
(05 Mar 2000)
hydratase
Trivial name applied, together with dehydratase, to certain hydro-lyases (EC class 4.2.1) catalyzing hydration-dehydration; e.g., fumarate-malate interconversion by fumarate hydratase.
(05 Mar 2000)
hydrate
<chemistry> A compound formed by the union of water with some other substance, generally forming a neutral body, as certain crystallized salts.
A substance which does not contain water as such, but has its constituents (hydrogen, oxygen, hydroxyl) so arranged that water may be eliminated; hence, a derivative of, or compound with, hydroxyl; hydroxide; as, ethyl hydrate, or common alcohol; calcium hydrate, or slaked lime.
Origin: Gr. "ydwr water: cf. F. Hydrate.
Source: Websters Dictionary
(01 Mar 1998)
hydrate crystal
One of several possible microstructural arrangements of water molecules based on intermolecular forces; suggested as being involved in the mode of action of inhalation anaesthetics.
(05 Mar 2000)
hydrate microcrystal theory of anaesthesia
A theory of narcosis pertaining to nonhydrogen-bonding agents; postulates the interaction of the molecules of the anaesthetic drug with water molecules in the brain.
Synonym: Pauling's theory.
(05 Mar 2000)
hydrated
Combined with water, forming a hydrate.
Synonym: hydrous.
(05 Mar 2000)
hydrated alumina
<chemical> Hydrated aluminum. A compound with many biomedical applications: as a gastric antacid, an antiperspirant, in dentifrices, as an emulsifier, as an adjuvant in bacterins and vaccines, in water purification, etc.
Pharmacological action: antacids, pharmaceutic aid.
Chemical name: Aluminum hydroxide (Al(OH)3)
(12 Dec 1998)
hydration
The condition of being combined with water.
(18 Nov 1997)
hydraulic
Of or pertaining to hydraulics, or to fluids in motion; conveying, or acting by, water; as, an hydraulic clock, crane, or dock. Hydraulic accumulator, an accumulator for hydraulic machinery of any kind. See Accumulator. Hydraulic brake, a cataract. See Cataract. Hydraulic cement, a cement or mortar made of hydraulic lime, which will harden under water. Hydraulic elevator, a lift operated by the weight or pressure of water. Hydraulic jack. See Jack. Hydraulic lime, quicklime obtained from hydraulic limestone, and used for cementing under water, etc. Hydraulic limestone, a limestone which contains some clay, and which yields a quicklime that will set, or form a firm, strong mass, under water. Hydraulic main An inverted cup with a partition dipping into water, for opening or closing communication between two gas mains, the open ends of which protrude about the water.
Origin: F. Hydraulique, L. Hydraulicus, fr. Gr, a water organ; "ydwr water + flute, pipe. See Hydra.
Source: Websters Dictionary
(01 Mar 1998)
hydraulic conductivity
Ease of pressure filtration of a liquid through a membrane; specifically, Kf = &eta;(Q/A) (dx/dP), where Kf = hydraulic conductivity, &eta; = viscosity of the liquid being filtered, Q/A = volume of liquid filtered per unit time and unit area, and dx/dP = reciprocal of the pressure gradient through the membrane; solute concentrations should be identical on both sides of the membrane. Also applied more loosely to measurements on a total membrane of unknown area and thickness with unmeasured fluid viscosity (K = Q/dP).
(05 Mar 2000)
hydraulic load
Amount of liquid going into a system.
(05 Dec 1998)
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