| eyedrop | (noun) a method of irrigating the eye used by ophthalmologists | Synonyms: eye-drop |
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| (noun) a drop from an eye dropper | Synonyms: eye-drop |
| finedraw | (verb) sew together very finely | - |
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| firedrake | (noun) a creature of Teutonic mythology; usually represented as breathing fire and having a reptilian body and sometimes wings | Synonyms: dragon, European dragon |
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| fluidram | (noun) a unit of capacity or volume in the apothecary system equal to one eighth of a fluid ounce | Synonyms: drachm, fluid drachm, fluid dram |
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| (noun) a British imperial capacity measure (liquid or dry) equal to 60 minims or 3.5516 cubic centimeters | Synonyms: drachm, fluid drachm, fluid dram |
| foundress | (noun) a woman founder | - |
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| foundry | (noun) factory where metal castings are produced | Synonyms: metalworks |
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| fundraise | (verb) raise money for a cause or project | Synonyms: fund-raise, fund raise |
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| fundraiser | (noun) a social function that is held for the purpose of raising money | - |
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| (noun) someone who solicits financial contributions | - |
| guardrail | (noun) a railing placed alongside a stairway or road for safety | Synonyms: safety rail |
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| guardroom | (noun) a room used by soldiers on guard | - |
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| (noun) a cell in which soldiers who are prisoners are confined | - |
| gumdrop | (noun) a jellied candy coated with sugar crystals | - |
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| gynandromorph | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: androgyne, epicene, epicene person, hermaphrodite, intersex |
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| gynandromorphic | (adjective) having both male and female morphological characteristics | Synonyms: gynandromorphous |
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| gynandromorphous | (adjective) having both male and female morphological characteristics | Synonyms: gynandromorphic |
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| hadron | (noun) any elementary particle that interacts strongly with other particles | - |
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| hadrosaur | (noun) any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic | Synonyms: duck-billed dinosaur, hadrosaurus |
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| hadrosaurus | (noun) any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic | Synonyms: duck-billed dinosaur, hadrosaur |
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| hairdresser | (noun) someone who cuts or beautifies hair | Synonyms: hairstylist, styler, stylist |
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| hairdressing | (noun) care for the hair: the activity of washing or cutting or curling or arranging the hair | Synonyms: hair care, haircare |
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| (noun) a toiletry for the hair | Synonyms: hair grease, hair oil, hair tonic |
| hamadryad | (noun) large cobra of southeastern Asia and the East Indies; the largest venomous snake; sometimes placed in genus Naja | Synonyms: king cobra, Naja hannah, Ophiophagus hannah |
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| (noun) the nymph or spirit of a particular tree | - |
| handrail | (noun) a railing at the side of a staircase or balcony to prevent people from falling | Synonyms: balusters, balustrade, banister, bannister |
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| handrest | (noun) a support for the hand | - |
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| headdress | (noun) clothing for the head | Synonyms: headgear |
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| headrace | (noun) a waterway that feeds water to a mill or water wheel or turbine | - |
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| headrest | (noun) a rest for the head | - |
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| (noun) a cushion attached to the top of the back of an automobile's seat to prevent whiplash | Synonyms: head restraint |
| headroom | (noun) the capacity of a system to reproduce loud sounds without distortion | Synonyms: dynamic headroom |
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| (noun) vertical space available to allow easy passage under something | Synonyms: clearance, headway |
| hemidrachm | (noun) an ancient Greek silver coin equal to 1/2 drachm or 3 obols in value. | - |
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| heraldry | (noun) emblem indicating the right of a person to bear arms | - |
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| (noun) the study and classification of armorial bearings and the tracing of genealogies | - |
| hexahedron | (noun) any polyhedron having six plane faces | - |
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| hidrosis | (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: diaphoresis, perspiration, sudation, sweating |
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| hidrotic | (adjective) of or relating to sweat | - |
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| hindrance | (noun) the act of hindering or obstructing or impeding | Synonyms: hinderance, interference |
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| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hitch, incumbrance, interference, preventative, preventive |
| (noun) something immaterial that interferes with or delays action or progress | Synonyms: balk, baulk, check, deterrent, handicap, hinderance, impediment |
| hippodrome | (noun) a stadium for horse shows or horse races | - |
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| humdrum | (adjective) tediously repetitious or lacking in variety | Synonyms: monotonous |
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| (adjective) not challenging; dull and lacking excitement | Synonyms: commonplace, prosaic, unglamorous, unglamourous |
| (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: monotony, sameness |
| hundred | (adjective) being ten more than ninety | Synonyms: 100, c, one hundred |
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| (noun) ten 10s | Synonyms: 100, C, century, one C |
| hundredfold | (adverb) by a factor of one hundred | Synonyms: a hundred times |
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| hundredth | (adjective) the ordinal number of one hundred in counting order | Synonyms: 100th, centesimal |
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| (noun) one part in a hundred equal parts | Synonyms: one-hundredth, one percent |
| (noun) position 100 in a countable series of things | - |
| hundredweight | (noun) a British unit of weight equivalent to 112 pounds | Synonyms: cwt, long hundredweight |
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| (noun) a United States unit of weight equivalent to 100 pounds | Synonyms: cental, centner, cwt, quintal, short hundredweight |
| (noun) a unit of weight equal to 100 kilograms in the metric system | Synonyms: centner, doppelzentner, metric hundredweight |
| husbandry | (noun) the practice of cultivating the land or raising stock | Synonyms: agriculture, farming |
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| hydra | (noun) small tubular solitary freshwater hydrozoan polyp | - |
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| (noun) trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality | - |
| hydralazine | (noun) an antihypertensive drug (trade name Apresoline) that dilates blood vessels; used (often with a diuretic) to treat hypertension and congestive heart failure | Synonyms: Apresoline |
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| hydramnios | (noun) an abnormality of pregnancy; accumulation of excess amniotic fluid | - |
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| hydrangea | (noun) any of various deciduous or evergreen shrubs of the genus Hydrangea | - |
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| hydrant | (noun) a discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks | - |
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| (noun) a faucet for drawing water from a pipe or cask | Synonyms: tap, water faucet, water tap |
| hydrargyrum | (noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures | Synonyms: atomic number 80, Hg, mercury, quicksilver |
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| hydrarthrosis | (noun) inflammation and swelling of a movable joint because of excess synovial fluid | - |
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| hydrate | (noun) any compound that contains water of crystallization | - |
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| (verb) cause to be hydrated; add water or moisture to | - |
| (verb) become hydrated and combine with water | - |
| (verb) supply water or liquid to in order to maintain a healthy balance | - |
| hydrated | (adjective) containing combined water (especially water of crystallization as in a hydrate) | Synonyms: hydrous |
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| hydration | (noun) the process of combining with water; usually reversible | - |
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| hydraulic | (adjective) of or relating to the study of hydraulics | - |
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| (adjective) moved or operated or effected by liquid (water or oil) | - |
| hydraulically | (adverb) in a hydraulic manner | Synonyms: hydraulicly |
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| hydraulicly | (adverb) in a hydraulic manner | Synonyms: hydraulically |
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| hydraulics | (noun) study of the mechanics of fluids | Synonyms: fluid mechanics |
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| hydrazide | (noun) any of a class of organic compounds sharing a common functional group characterized by a nitrogen to nitrogen covalent bond with 4 substituents with at least one of them being an acyl group. | - |
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| hydrazine | (noun) a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels | - |
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| hydrazoite | (noun) a salt of hydrazoic acid | - |
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| hydremia | (noun) blood disorder in which there is excess fluid volume compared with the cell volume of the blood | - |
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| hydric | (adjective) having or characterized by excessive moisture | - |
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| hydride | (noun) any binary compound formed by the union of hydrogen and other elements | - |
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| hydrilla | (noun) submersed plant with whorled lanceolate leaves and solitary axillary flowers; Old World plant naturalized in southern United States and clogging Florida's waterways | Synonyms: Hydrilla verticillata |
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| hydrocarbon | (noun) an organic compound containing only carbon and hydrogen | - |
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| hydrocele | (noun) disorder in which serous fluid accumulates in a body sac (especially in the scrotum) | - |
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| hydrocephalic | (adjective) relating to or characterized by or evidencing hydrocephalus | - |
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| hydrocephalus | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephaly |
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| hydrocephaly | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephalus |
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| hydrochloride | (noun) a complex consisting of an organic base in association with hydrogen chloride | - |
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| hydrochlorofluorocarbon | (noun) a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere | Synonyms: HCFC |
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| hydrochlorothiazide | (noun) a diuretic drug (trade name Microzide, Esidrix, and HydroDIURIL) used in the treatment of hypertension | Synonyms: Esidrix, HydroDIURIL, Microzide |
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| hydrocolloid | (noun) a substance that forms a gel with water | - |
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| hydrocortisone | (noun) an adrenal-cortex hormone (trade names Hydrocortone or Cortef) that is active in carbohydrate and protein metabolism | Synonyms: Cortef, cortisol, Hydrocortone |
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| hydrocracking | (noun) the process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst | - |
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| hydrodynamic | (adjective) of or relating to hydrodynamics | - |
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| hydrodynamics | (noun) study of fluids in motion | Synonyms: hydrokinetics |
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| hydroelectric | (adjective) of or relating to or used in the production of electricity by waterpower | - |
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| hydroelectricity | (noun) electricity produced by water power | - |
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| hydroflumethiazide | (noun) diuretic used to treat hypertension and edema | - |
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| hydrofluorocarbon | (noun) a fluorocarbon emitted as a by-product of industrial manufacturing | Synonyms: HFC |
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| hydrofoil | (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydroplane |
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| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: foil |
| hydrogel | (noun) a colloidal gel in which water is the dispersion medium | - |
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| hydrogen | (noun) a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe | Synonyms: atomic number 1, H |
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| hydrogenate | (verb) combine or treat with or expose to hydrogen; add hydrogen to the molecule of (an unsaturated organic compound) | - |
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| hydrogenation | (noun) a chemical process that adds hydrogen atoms to an unsaturated oil | - |
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| hydrographic | (adjective) of or relating to the science of hydrography | Synonyms: hydrographical |
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| hydrographical | (adjective) of or relating to the science of hydrography | Synonyms: hydrographic |
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| hydrography | (noun) the science of the measurement and description and mapping of the surface waters of the earth with special reference to navigation | - |
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| hydroid | (noun) colonial coelenterates having the polyp phase dominant | Synonyms: hydrozoan |
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| hydroisohypse | (noun) a line on a map connecting points of equal level on the piezometric surface. | - |
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| hydroisopieze | (noun) a line on a map connecting points of identical pressures in the water bearing stratum. | - |
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| hydrokinetic | (adjective) relating to fluids in motion or the forces that produce or affect such motion | - |
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| hydrokinetics | (noun) study of fluids in motion | Synonyms: hydrodynamics |
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| hydrolise | (verb) make a compound react with water and undergo hydrolysis | Synonyms: hydrolize |
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| hydrolith | (noun) a saltlike binary compound (CaH2) used as a reducing agent and source of hydrogen | Synonyms: calcium hydride |
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| hydrolize | (verb) make a compound react with water and undergo hydrolysis | Synonyms: hydrolise |
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| hydrologist | (noun) a geologist skilled in hydrology | - |
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| hydrology | (noun) the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation | - |
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| hydrolysate | (noun) a product of hydrolysis | - |
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| hydrolyse | (verb) undergo hydrolysis; decompose by reacting with water | Synonyms: hydrolyze |
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| hydrolysis | (noun) a chemical reaction in which water reacts with a compound to produce other compounds; involves the splitting of a bond and the addition of the hydrogen cation and the hydroxide anion from the water | - |
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| hydrolyzable | (adjective) capable of undergoing hydrolysis | - |
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| hydrolyze | (verb) undergo hydrolysis; decompose by reacting with water | Synonyms: hydrolyse |
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