See Also: hydro-(dictionary)
Hydro-d(health)
hydro(1)(dictionary)
hydro(2)(dictionary)
hydro-(dictionary)
hydro-(medicine)
hydro-mulching(medicine)
BANGOR HYDRO(finance)
hydro-lyases(medicine)
hydro-electric(medicine)

hydro- (iou)



hydro- combining form. Before a vowel also hydr-.
[Greek hudro- combining form of hudor water: see -O-. In senses 3 & 4 partly from the definientia, which are themselves from Greek hudro-.]
1. Water; liquid.
2. Medicine. (An accumulation of) watery or serous fluid.
3. Chemistry. Hydrogen.
4. Zoology. Hydrozoa, hydrozoan; hydroid.
hydro-aro'matic adjective & noun (Chemistry) (a compound) having one or more benzene rings which are partly or completely hydrogenated (reduced) E20.
hydrobio'logic adjective = hydrobiological E20.
hydrobio'logical adjective of or pertaining to hydrobiology M20.
hydrobi'ologist noun an expert in or student of hydrobiology E20.
hydrobi'ology noun the branch of biology that deals with aquatic plants and animals E20.
hydro'borate noun & verb (Chemistry) (a) noun = BOROHYDRIDE; (b) verb trans. add a boron compound to (another compound) by hydroboration: M20.
hydrobo'ration noun (Chemistry) a reaction of the type :BH + :CC: :B(C:)CH:, where a boron-hydrogen pair of atoms is added across a double or triple bond between a carbon atom and another atom; the process of subjecting to such a reaction: M20.
hydro'bromic adjective (Chemistry):
hydrobromic acid, a strong acid that is a colourless or pale yellow aqueous solution of the gas hydrogen bromide, HBr M19.
hydrocast noun (Oceanography) a long cable with sampling bottles attached at intervals; an operation in which this is used: M20.
,hydrochloro'fluorocarbon noun any of a class of partly chlorinated and fluorinated hydrocarbons, used as less ozone-destructive substitutes for CFCs (abbreviation
HCFC) L20.
hydrochloro'thiazide, hydrochlorthiazide noun (Pharmacology) a sulphonamide drug, C7H8ClN3O4S2, related to chlorothiazide and used to treat oedema and hypertension M20.
hydrochore noun a hydrochoric plant E20.
hydrochoric involving or characterized by the dispersal of plant seeds by water M20.
hydrochorous adjective hydrochoric E20.
noun metallurgical processes in which chemical reactions in water, such as leaching or precipitation, are used to extract or assay metals M19.
hydro'meteor noun an atmospheric phenomenon or entity involving water or water vapour M19.
hydrometeoro'logical adjective of or pertaining to hydrometeorology L19.
hydrometeo'rology noun (a) rare the branch of meteorology that deals with hydrometeors; (b) meteorology as it relates to or is applied to hydrological matters: M19.
hydrone'phrosis noun distension of the renal pelvis with urine, usually as a result of an obstructed outflow M19.
hydrone'phrotic adjective of, characteristic of, or affected with hydronephrosis M19.
hydronym noun a name of a body of water, such as a river or sea M20.
hydro'nymic adjective of, pertaining to, or designating a hydronym M20.
hy'dronymy noun the branch of knowledge that deals with hydronyms; hydronyms collectively: M20.
hydro-oxygen noun oxy-hydrogen: only in M19.
hydroperi'cardium noun (Medicine) (the condition of having) an accumulation of watery fluid within the pericardium M19.
hydrope'roxide noun (Chemistry) any compound containing the hydroperoxyl group in its molecule E20.
hydrope'roxyl noun (Chemistry) the radical HOO; usu. attrib.: M20.
hydroplant noun a hydroelectric generating station E20.
hydropneu'matic adjective (of apparatus) involving the action of both water and air; partly hydraulic and partly pneumatic: L18.
hydropower noun hydroelectric power M20.
hydro'quinone noun a substance formed by the reduction of quinone, used as a photographic developer; 1,4-dihydroxybenzene, C6H4(OH)2: M19.
hydro'salpinx noun, pl. -salpinges Medicine (the condition of having) an accumulation of watery fluid in the Fallopian tubes M19.
hydrosere noun (Ecology) a plant succession originating in a wet habitat E20.
hydroski noun a hydrofoil on a seaplane or amphibious aircraft that skims the surface of the water during take-off and provides extra lift M20.
hydrosome noun (Zoology) the body of a colonial hydrozoan M19.
hydrospeed,
hydrospeeding nouns a sport or leisure activity that involves jumping into fast-flowing white water and being carried along at high speed while buoyed up by a float L20.
hydrosphere noun the waters of the earth's surface L19.
hydrospire noun (Zoology) any of a number of respiratory tubes or pouches in blastoids M19.
hydro'theca noun, pl. -cae, Zoology in some colonial hydrozoans, a cuplike extension of the perisarc that partly encloses a hydranth L19.
hydro'thorax noun (Medicine) (the condition of having) an accumulation of fluid in one or both of the pleural cavities L18.
hydrotreat verb trans. subject to hydrotreatment M20.
hydrotreater noun an apparatus or plant where hydrotreatment is carried out M20.
hydrotreatment noun the treatment of petroleum products with hydrogen in the presence of a catalyst, esp. at a higher temperature and pressure than in hydrofining M20.
hydrovane noun (a) = HYDROPLANE noun 1; (b) = HYDROFOIL 1: E20.
hydrowire noun a cable used for hydrocasts M20.
hydrozincite noun (Mineralogy) a monoclinic basic carbonate of zinc that is a secondary mineral occurring as light-coloured crusts on zinc deposits M19.