| frangipane | (noun) pastry with a creamy almond-flavored filling | - |
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| freestone | (noun) fruit (especially peach) whose flesh does not adhere to the pit | - |
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| friendzone | (verb) To treat as a friend although the other party has romantic feelings | - |
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| fullerene | (noun) a form of carbon having a large molecule consisting of an empty cage of sixty or more carbon atoms | - |
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| furane | (noun) a colorless toxic flammable liquid used in the synthesis of nylon | Synonyms: furan, furfuran |
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| gabardine | (noun) a firm durable fabric with a twill weave | - |
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| (noun) a loose coverall (coat or frock) reaching down to the ankles | Synonyms: dust coat, duster, gaberdine, smock |
| (noun) (usually in the plural) trousers made of flannel or gabardine or tweed or white cloth | Synonyms: flannel, tweed, white |
| gaberdine | (noun) a loose coverall (coat or frock) reaching down to the ankles | Synonyms: dust coat, duster, gabardine, smock |
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| galantine | (noun) boned poultry stuffed then cooked and covered with aspic; served cold | - |
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| gallamine | (noun) neuromuscular blocking agent (trade name Flaxedil) used as a muscle relaxant in the administration of anesthesia | Synonyms: Flaxedil |
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| gallstone | (noun) a calculus formed in the gall bladder or its ducts | Synonyms: bilestone |
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| gamine | (noun) a girl of impish appeal | - |
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| (noun) a homeless girl who roams the streets | - |
| gangrene | (noun) the localized death of living cells (as from infection or the interruption of blood supply) | Synonyms: mortification, necrosis, sphacelus |
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| (noun) necrotic tissue; a mortified or gangrenous part or mass | Synonyms: slough, sphacelus |
| (verb) undergo necrosis | Synonyms: mortify, necrose, sphacelate |
| ganoine | (noun) shiny substance that resemble enamel and is secreted by the corium of certain fishes (especially ganoid fishes) and composes the outer layer of their scales | Synonyms: ganoin |
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| gasolene | (noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines | Synonyms: gas, gasoline, petrol |
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| gasoline | (noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines | Synonyms: gas, gasolene, petrol |
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| gelatine | (noun) a colorless water-soluble glutinous protein obtained from animal tissues such as bone and skin | Synonyms: gelatin |
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| gemstone | (noun) a crystalline rock that can be cut and polished for jewelry | Synonyms: gem, stone |
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| gene | (noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Synonyms: cistron, factor |
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| genuine | (adjective) not fake or counterfeit | Synonyms: echt |
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| (adjective) not pretended; sincerely felt or expressed | Synonyms: true, unfeigned |
| (adjective) being or reflecting the essential or genuine character of something | Synonyms: actual, literal, real |
| germane | (adjective) relevant and appropriate | - |
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| gigatonne | (noun) a unit of weight equivalent to 1 billion tonnes. | Synonyms: Gt |
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| glucosamine | (noun) an amino derivative of glucose that is a component of many polysaccharides | - |
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| glutamine | (noun) a crystalline amino acid occurring in proteins; important in protein metabolism | - |
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| glycerine | (noun) a sweet syrupy trihydroxy alcohol obtained by saponification of fats and oils | Synonyms: glycerin, glycerol |
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| glycine | (noun) the simplest amino acid found in proteins and the principal amino acid in sugar cane | - |
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| glyoxaline | (noun) an organic base C3H4N2; a histamine inhibitor | Synonyms: imidazole, iminazole |
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| goldmine | (noun) a mine where gold ore is found | Synonyms: gold mine |
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| (noun) a good source of something that is desired | Synonyms: gold mine |
| goldstone | (noun) aventurine spangled densely with fine gold-colored particles | - |
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| gone | (adjective) stupefied or excited by a chemical substance (especially alcohol) | Synonyms: drunk, inebriated, intoxicated, ripped |
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| (adjective) dead | Synonyms: asleep, at peace, at rest, deceased, departed |
| (adjective) destroyed or killed | Synonyms: done for, kaput |
| (adjective) well in the past; former | Synonyms: bygone, bypast, departed, foregone |
| (adjective) drained of energy or effectiveness; extremely tired; completely exhausted | Synonyms: dog-tired, exhausted, fagged, fatigued, played out, spent, washed-out, worn-out, worn out |
| (adjective) used up or no longer available | - |
| gramophone | (noun) an antique record player; the sound of the vibrating needle is amplified acoustically | Synonyms: acoustic gramophone |
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| grapevine | (noun) gossip spread by spoken communication | Synonyms: pipeline, word of mouth |
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| (noun) any of numerous woody vines of genus Vitis bearing clusters of edible berries | Synonyms: grape, grape vine |
| gravestone | (noun) a stone that is used to mark a grave | Synonyms: headstone, tombstone |
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| gregarine | (noun) vermiform protozoans parasitic in insects and other invertebrates | - |
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| grenadine | (noun) thin syrup made from pomegranate juice; used in mixed drinks | - |
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| grindstone | (noun) a revolving stone shaped like a disk; used to grind or sharpen or polish edge tools | - |
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| gritstone | (noun) a hard coarse-grained siliceous sandstone | Synonyms: grit, gritrock |
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| groyne | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: breakwater, bulwark, groin, jetty, mole, seawall |
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| guanine | (noun) a purine base found in DNA and RNA; pairs with cytosine | Synonyms: G |
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| guanosine | (noun) a nucleoside component of DNA; composed of guanine and deoxyribose | Synonyms: deoxyguanosine |
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| guaranine | (noun) Guaranine is the name used to describe caffeine derived from the guarana plant. | - |
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| guideline | (noun) a rule or principle that provides guidance to appropriate behavior | Synonyms: guidepost, rule of thumb |
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| (noun) a detailed plan or explanation to guide you in setting standards or determining a course of action | Synonyms: road map |
| (noun) a light line that is used in lettering to help align the letters | - |
| guillotine | (noun) instrument of execution that consists of a weighted blade between two vertical poles; used for beheading people | - |
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| (noun) closure imposed on the debate of specific sections of a bill | Synonyms: closure by compartment |
| (verb) kill by cutting the head off with a guillotine | - |
| gyroplane | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogiro, autogyro |
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| hailstone | (noun) small pellet of ice that falls during a hailstorm | - |
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| hairline | (noun) the natural margin formed by hair on the head | - |
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| (noun) a very thin line | - |
| halftone | (noun) an engraving used to reproduce an illustration | Synonyms: halftone engraving, photoengraving |
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| (noun) a print obtained from photoengraving | - |
| haloalkane | (noun) organic compound in which halogen atoms have been substituted for hydrogen atoms in an alkane | Synonyms: alkyl halide |
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| halothane | (noun) a nonflammable inhalation anesthetic that produces general anesthesia; used along with analgesics and muscle relaxants for many types of surgical procedures | - |
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| handline | (noun) a fishing line managed principally by hand | Synonyms: hand line |
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| (noun) (climbing) a line that can be hung onto with hands while climbing up or down a steep or slick section for limited protection. | - |
| hardline | (adjective) firm and uncompromising | Synonyms: hard-line |
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| headline | (noun) the heading or caption of a newspaper article | Synonyms: newspaper headline |
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| (verb) publicize widely or highly, as if with a headline | - |
| (verb) provide (a newspaper page or a story) with a headline | - |
| headphone | (noun) electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear | Synonyms: earphone, earpiece, phone |
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| headstone | (noun) the central building block at the top of an arch or vault | Synonyms: key, keystone |
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| (noun) a stone that is used to mark a grave | Synonyms: gravestone, tombstone |
| hearthstone | (noun) a stone that forms a hearth | - |
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| heckelphone | (noun) an oboe pitched an octave below the ordinary oboe | Synonyms: basset oboe |
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| heelbone | (noun) the largest tarsal bone; forms the human heel | Synonyms: calcaneus, os tarsi fibulare |
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| helleborine | (noun) any of several orchids of the genus Cephalanthera | - |
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| (noun) any of various orchids of the genus Epipactis | - |
| (noun) any of several small temperate and tropical orchids having mottled or striped leaves and spikes of small yellowish-white flowers in a twisted raceme | Synonyms: rattlesnake plantain |
| hemline | (noun) the line formed by the lower edge of a skirt or coat | - |
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| henbane | (noun) poisonous fetid Old World herb having sticky hairy leaves and yellow-brown flowers; yields hyoscyamine and scopolamine | Synonyms: black henbane, Hyoscyamus niger, stinking nightshade |
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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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| heroine | (noun) a woman possessing heroic qualities or a woman who has performed heroic deeds | - |
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| (noun) the main good female character in a work of fiction | - |
| herringbone | (noun) a twilled fabric with a herringbone pattern | - |
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| (noun) a pattern of columns of short parallel lines with all the lines in one column sloping one way and lines in adjacent columns sloping the other way; it is used in weaving, masonry, parquetry, embroidery | Synonyms: herringbone pattern |
| heterodyne | (adjective) of or relating to the beat produced by heterodyning two oscillations | - |
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| (verb) combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two | - |
| hexachlorophene | (noun) antibacterial substance that is a water-soluble powder used in antiseptic soaps and toothpaste | - |
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| hexane | (noun) a colorless flammable liquid alkane derived from petroleum and used as a solvent | - |
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| hexine | (noun) a hydrocarbon, C6H10, of the acetylene series. | - |
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| hipbone | (noun) large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis | Synonyms: innominate bone |
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| hipline | (noun) the line formed by the lower edge of hip-length garment | - |
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| (noun) the line formed by measuring the hip at its greatest part | - |
| hircine | (adjective) of or pertaining to or suggestive of a goat (especially in strong odor) | - |
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| histamine | (noun) amine formed from histidine that stimulates gastric secretions and dilates blood vessels; released by the human immune system during allergic reactions | - |
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| histidine | (noun) an essential amino acid found in proteins that is important for the growth and repair of tissue | - |
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| histone | (noun) a simple protein containing mainly basic amino acids; present in cell nuclei in association with nucleic acids | - |
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| holystone | (noun) a soft sandstone used for scrubbing the decks of a ship | - |
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| (verb) scrub with a holystone | - |
| hominine | (adjective) characteristic of humankind | - |
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| homophone | (noun) two words are homophones if they are pronounced the same way but differ in meaning or spelling or both (e.g. bare and bear) | - |
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| hone | (noun) a whetstone made of fine gritstone; used for sharpening razors | - |
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| (noun) a tool consisting of a number of fine abrasive slips held in a machine head, rotated and reciprocated to impart a smooth finish to cylinder bores, etc. | - |
| (verb) make perfect or complete | Synonyms: perfect |
| (verb) sharpen with a hone | - |
| hormone | (noun) the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect | Synonyms: endocrine, internal secretion |
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| hornstone | (noun) a fine-grained metamorphic rock formed by the action of heat on clay rocks | Synonyms: hornfels |
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| hotline | (noun) a telefone line that provides direct and prompt information or advice to the caller in relation to a specific subject | Synonyms: hot line |
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| humane | (adjective) marked or motivated by concern with the alleviation of suffering | - |
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| (adjective) pertaining to or concerned with the humanities | Synonyms: humanist, humanistic |
| (adjective) showing evidence of moral and intellectual advancement | - |
| hurricane | (noun) a severe tropical cyclone usually with heavy rains and winds moving at 63-136 knots (12 on the Beaufort scale) | - |
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| hyaline | (adjective) resembling glass in transparency or translucency | Synonyms: hyaloid |
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| (noun) a glassy translucent substance that occurs in hyaline cartilage or in certain skin conditions | Synonyms: hyalin |
| 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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| hydrazine | (noun) a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels | - |
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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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| hydromorphone | (noun) a narcotic analgesic (trade name Dilaudid) used to treat moderate to severe pain | Synonyms: Dilaudid, hydromorphone hydrochloride |
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| hydroplane | (noun) an airplane that can land on or take off from water | Synonyms: seaplane |
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| (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydrofoil |
| (verb) glide on the water in a hydroplane | Synonyms: seaplane |
| hydroxybenzene | (noun) a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally | Synonyms: carbolic acid, oxybenzene, phenol, phenylic acid |
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| hydroxychloroquine | (noun) anti-inflammatory drug (trade name Plaquenil) used in the treatment of rheumatoid arthritis and malaria and lupus erythematosus | Synonyms: Plaquenil |
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| hydroxyproline | (noun) a crystalline amino acid obtained from gelatin or collagen | - |
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| hydroxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: oxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| hydroxyzine | (noun) a drug (trade names Atarax and Vistaril) used as a tranquilizer to treat anxiety and motion sickness | Synonyms: Atarax, hydroxyzine hydrochloride, Vistaril |
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| hygiene | (noun) the science concerned with the prevention of illness and maintenance of health | Synonyms: hygienics |
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| (noun) a condition promoting sanitary practices | - |
| hyoscine | (noun) an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures | Synonyms: scopolamine |
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| hyoscyamine | (noun) a poisonous crystalline alkaloid (isometric with atropine but more potent); used to treat excess motility of the gastrointestinal tract | - |
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| hyperfine | (adjective) extremely fine or thin, as in a spectral line split into two or more components | - |
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| illumine | (verb) introduce light into | Synonyms: illume, illuminate, light, light up |
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| imagine | (verb) expect, believe, or suppose | Synonyms: guess, opine, reckon, suppose, think |
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| (verb) form a mental image of something that is not present or that is not the case | Synonyms: conceive of, envisage, ideate |
| imipramine | (noun) a tricyclic antidepressant (trade names Imavate and Tofranil) used to treat clinical depression | Synonyms: Imavate, impramine hydrochloride, Tofranil |
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| immune | (adjective) relating to the condition of immunity | - |
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| (adjective) secure against | - |
| (adjective) (usually followed by `to') not affected by a given influence | - |
| (adjective) relating to or conferring immunity (to disease or infection) | Synonyms: resistant |
| (noun) a person who is immune to a particular infection | - |