| epistasis | (noun) the suppression of a gene by the effect of an unrelated gene | Synonyms: hypostasis |
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| epistaxis | (noun) bleeding from the nose | Synonyms: nosebleed |
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| episteme | (noun) the body of ideas that determine the knowledge that is intellectually certain at any particular time | - |
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| epistemologist | (noun) a specialist in epistemology | - |
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| epistemology | (noun) the philosophical theory of knowledge | - |
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| epistle | (noun) a specially long, formal letter | - |
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| epistrophe | (noun) repetition of the ends of two or more successive sentences, verses, etc. | Synonyms: epiphora |
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| epitaph | (noun) an inscription on a tombstone or monument in memory of the person buried there | - |
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| (noun) a summary statement of commemoration for a dead person | - |
| epitaxy | (noun) growing a crystal layer of one mineral on the crystal base of another mineral in such a manner that its crystalline orientation is the same as that of the substrate | - |
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| epithalamium | (noun) an ode honoring a bride and bridegroom | - |
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| epithelioma | (noun) a malignant tumor of the epithelial tissue | - |
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| epithelium | (noun) membranous tissue covering internal organs and other internal surfaces of the body | Synonyms: epithelial tissue |
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| epithet | (noun) descriptive word or phrase | - |
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| (noun) a defamatory or abusive word or phrase | Synonyms: name |
| epitome | (noun) a standard or typical example | Synonyms: image, paradigm, prototype |
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| (noun) a brief abstract (as of an article or book) | - |
| epitope | (noun) the site on the surface of an antigen molecule to which an antibody attaches itself | Synonyms: antigenic determinant, determinant |
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| epixylon | (noun) organisms that are attached to submerged wood surfaces in aquatic ecosystems. | - |
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| epizoan | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, ectozoon, epizoon |
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| epizoon | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, ectozoon, epizoan |
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| epoch | (noun) a period marked by distinctive character or reckoned from a fixed point or event | Synonyms: era |
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| (noun) a unit of geological time that is a subdivision of a period and is itself divided into ages | - |
| (noun) (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded | Synonyms: date of reference |
| eponym | (noun) the name derived from a person (real or imaginary) | - |
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| (noun) the person for whom something is named | - |
| eponymy | (noun) the derivation of a general name from that of a famous person | - |
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| epos | (noun) a long narrative poem telling of a hero's deeds | Synonyms: epic, epic poem, heroic poem |
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| (noun) a body of poetry that conveys the traditions of a society by treating some epic theme | - |
| epoxy | (noun) a thermosetting resin; used chiefly in strong adhesives and coatings and laminates | Synonyms: epoxy glue, epoxy resin |
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| epsilon | (noun) the 5th letter of the Greek alphabet | - |
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| eptatretus | (noun) a fossil hagfish of the genus Eptatretus | - |
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| etanercept | (noun) a genetically engineered anti-TNF compound (trade name Enbrel) consisting of receptors that bind TNF; it is injected twice a week in the treatment of rheumatoid arthritis | Synonyms: Enbrel |
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| exception | (noun) a deliberate act of omission | Synonyms: elision, exclusion |
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| (noun) an instance that does not conform to a rule or generalization | - |
| (noun) grounds for adverse criticism | - |
| exteroception | (noun) sensitivity to stimuli originating outside of the body | - |
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| exteroceptor | (noun) any receptor that responds to stimuli outside the body | - |
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| eyepatch | (noun) a protective cloth covering for an injured eye | Synonyms: patch |
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| eyepiece | (noun) combination of lenses at the viewing end of optical instruments | Synonyms: ocular |
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| facepalm | (noun) the act of putting your hand to cover your face to show disappointment or despair | - |
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| faceplate | (noun) a protective covering for the front of a machine or device (as a door lock or computer component) | - |
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| fibrinopeptide | (noun) peptide released from the amino end of fibrinogen by the action of thrombin to form fibrin during clotting of the blood | - |
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| fireplace | (noun) an open recess in a wall at the base of a chimney where a fire can be built | Synonyms: hearth, open fireplace |
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| fireplug | (noun) an upright hydrant for drawing water to use in fighting a fire | Synonyms: fire hydrant, plug |
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| firepower | (noun) (military) the relative capacity for delivering fire on a target | - |
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| fivepence | (noun) a coin worth five cents | - |
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| flunitrazepam | (noun) a depressant and tranquilizer (trade name Rohypnol) often used in the commission of sexual assault; legally available in Europe and Mexico and Colombia | Synonyms: Rohypnol |
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| flurazepam | (noun) tranquilizer (trade name Dalmane) used to treat insomnia | Synonyms: Dalmane, flurazepam hydrochloride |
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| footstep | (noun) the act of taking a step in walking | - |
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| (noun) the sound of a step of someone walking | Synonyms: footfall, step |
| (noun) the distance covered by a step | Synonyms: pace, step, stride |
| forceps | (noun) an extractor consisting of a pair of pincers used in medical treatment (especially for the delivery of babies) | - |
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| forepart | (noun) the side that is forward or prominent | Synonyms: front, front end |
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| forepaw | (noun) front paw; analogous to the human hand | - |
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| foreperson | (noun) the presiding member of the jury and the one who speaks on their behalf | - |
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| foreplay | (noun) mutual sexual fondling prior to sexual intercourse | Synonyms: arousal, stimulation |
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| freeperson | (noun) a person who is not a serf or a slave | - |
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| fringepod | (noun) annual herb having pinnatifid basal leaves and slender racemes of small white flowers followed by one-seeded winged silicles | Synonyms: lacepod |
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| gamekeeper | (noun) a person employed to take care of game and wildlife | Synonyms: game warden |
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| gatekeeper | (noun) someone who guards an entrance | Synonyms: door guard, doorkeeper, doorman, hall porter, ostiary, porter |
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| (noun) someone who controls access to something | - |
| gatepost | (noun) either of two posts that bound a gate | - |
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| ginep | (noun) tropical American tree bearing a small edible fruit with green leathery skin and sweet juicy translucent pulp | Synonyms: genip, honey berry, mamoncillo, Melicocca bijuga, Melicocca bijugatus, Spanish lime, Spanish lime tree |
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| glomerulonephritis | (noun) nephritis marked by inflammation of the glomeruli of the kidney; characterized by decreased production of urine and by the presence of blood and protein in the urine and by edema | - |
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| goalkeeper | (noun) the defensive position on an ice hockey or soccer or lacrosse team who stands in front of the goal and tries to prevent opposing players from scoring | Synonyms: goalie, goaltender, netkeeper |
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| (noun) the soccer or hockey player assigned to protect the goal | Synonyms: goalie, goaltender, netkeeper, netminder |
| grandnephew | (noun) a son of your niece or nephew | Synonyms: great-nephew |
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| greasepaint | (noun) a greasy substance used as makeup by actors | - |
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| greenskeeper | (noun) someone responsible for the maintenance of a golf course | - |
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| groundkeeper | (noun) someone who maintains the grounds (of an estate or park or athletic field) | Synonyms: groundskeeper, groundsman |
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| groundskeeper | (noun) someone who maintains the grounds (of an estate or park or athletic field) | Synonyms: groundkeeper, groundsman |
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| guidepost | (noun) a rule or principle that provides guidance to appropriate behavior | Synonyms: guideline, rule of thumb |
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| (noun) a post bearing a sign that gives directions or shows the way | Synonyms: signpost |
| hawsepipe | (noun) the hole that an anchor rope passes through | Synonyms: hawse, hawsehole |
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| hebephrenia | (noun) a form of schizophrenia characterized by severe disintegration of personality including erratic speech and childish mannerisms and bizarre behavior; usually becomes evident during puberty; the most common diagnostic category in mental institutions | Synonyms: disorganized schizophrenia, disorganized type schizophrenia, hebephrenic schizophrenia |
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| hemiepiphyte | (noun) a plant that is an epiphyte for part of its life | Synonyms: semiepiphyte |
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| hepadnavirus | (noun) a group of animal DNA viruses including viruses of ducks and woodchucks and squirrels and others as well as the virus causing hepatitis B in humans | - |
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| heparin | (noun) a polysaccharide produced in basophils (especially in the lung and liver) and that inhibits the activity of thrombin in coagulation of the blood; it (trade names Lipo-Hepin and Liquaemin) is used as an anticoagulant in the treatment of thrombosis and in heart surgery | Synonyms: Lipo-Hepin, Liquaemin |
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| hepatic | (noun) any of numerous small green nonvascular plants of the class Hepaticopsida growing in wet places and resembling green seaweeds or leafy mosses | Synonyms: liverwort |
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| hepatica | (noun) any of several plants of the genus Hepatica having three-lobed leaves and white or pinkish flowers in early spring; of moist and mossy subalpine woodland areas of north temperate regions | Synonyms: liverleaf |
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| (noun) a common liverwort | Synonyms: Marchantia polymorpha |
| hepatitis | (noun) inflammation of the liver caused by a virus or a toxin | - |
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| hepatocarcinoma | (noun) carcinoma of the liver | Synonyms: hepatocellular carcinoma, hepatoma, malignant hepatoma |
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| hepatoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: lactoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| hepatoma | (noun) carcinoma of the liver | Synonyms: hepatocarcinoma, hepatocellular carcinoma, malignant hepatoma |
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| hepatomegaly | (noun) abnormal enlargement of the liver | Synonyms: megalohepatia |
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| hepatotoxin | (noun) any toxin that affects the liver | - |
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| heptad | (noun) the cardinal number that is the sum of six and one | Synonyms: 7, septenary, septet, seven, sevener, VII |
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| heptagon | (noun) a seven-sided polygon | - |
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| heptane | (noun) a colorless volatile highly flammable liquid obtained from petroleum and used as an anesthetic or a solvent or in determining octane ratings | - |
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| heptasyllable | (noun) a word or line of verse of seven syllables. | - |
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| heptose | (noun) a monosaccharide with seven carbon atoms. | - |
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| hodgepodge | (noun) a theory or argument made up of miscellaneous or incongruous ideas | Synonyms: jumble, patchwork |
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| (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hotchpotch, melange, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
| holocephalan | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalian |
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| holocephalian | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalan |
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| homepage | (noun) the opening page of a web site; also, the first page opened when a web browser is launched (default or start-up page) | Synonyms: home page |
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| honeycreeper | (noun) small bright-colored tropical American songbird with a curved bill for sucking nectar | - |
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| (noun) small to medium-sized finches of the Hawaiian islands | Synonyms: Hawaiian honeycreeper |
| horseplay | (noun) rowdy or boisterous play | - |
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| horsepond | (noun) a pond for watering horses | - |
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| horsepower | (noun) a unit of power equal to 746 watts | Synonyms: H.P., HP |
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| hosepipe | (noun) a flexible pipe for conveying a liquid or gas | Synonyms: hose |
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| hotelkeeper | (noun) an owner or manager of hotels | Synonyms: hosteller, hotel manager, hotelier, hotelman |
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| housekeeper | (noun) a servant who is employed to perform domestic task in a household | - |
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| housekeeping | (noun) the work of cleaning and running a house | Synonyms: housework |
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| housepaint | (noun) paint used to cover the exterior woodwork of a house | Synonyms: house paint |
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| houseplant | (noun) any of a variety of plants grown indoors for decorative purposes | - |
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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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| hydronephrosis | (noun) accumulation of urine in the kidney because of an obstruction in the ureter | - |
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| hysterocatalepsy | (noun) hysteria with cataleptic symptoms | - |
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| icepick | (noun) pick consisting of a steel rod with a sharp point; used for breaking up blocks of ice | Synonyms: ice pick |
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| imperceptibility | (noun) the property of being imperceptible by the mind or the senses | - |
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| inception | (noun) an event that is a beginning; a first part or stage of subsequent events | Synonyms: origin, origination |
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| independence | (noun) the successful ending of the American Revolution | - |
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| (noun) freedom from control or influence of another or others | Synonyms: independency |