| erne | (noun) bulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland | Synonyms: ern, European sea eagle, gray sea eagle, grey sea eagle, Haliatus albicilla, white-tailed sea eagle |
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| estrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: Estronol, oestrone, theelin |
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| etamine | (noun) a soft cotton or worsted fabric with an open mesh; used for curtains or clothing etc. | Synonyms: etamin |
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| ethane | (noun) a colorless odorless alkane gas used as fuel | Synonyms: C2H6 |
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| ethene | (noun) a flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic | Synonyms: ethylene |
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| ethoxyethane | (noun) a colorless volatile highly flammable liquid formerly used as an inhalation anesthetic | Synonyms: diethyl ether, divinyl ether, ether, ethyl ether, vinyl ether |
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| ethylene | (noun) a flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic | Synonyms: ethene |
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| ethyne | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: acetylene, alkyne |
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| exocrine | (noun) a gland that secretes externally through a duct | Synonyms: duct gland, exocrine gland |
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| famine | (noun) a severe shortage of food (as through crop failure) resulting in violent hunger and starvation and death | - |
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| (noun) an acute insufficiency | Synonyms: dearth, shortage |
| famotidine | (noun) a histamine blocker (trade name Pepcid) used to treat peptic ulcers and gastritis and esophageal reflux | Synonyms: Pepcid |
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| fedelline | (noun) extremely fine pasta thinner than vermicelli | - |
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| feline | (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: felid |
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| feminine | (noun) a gender that refers chiefly (but not exclusively) to females or to objects classified as female | - |
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| fettuccine | (noun) pasta in flat strips wider than linguine | Synonyms: fettuccini |
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| fieldstone | (noun) stone that occurs naturally in fields; often used as building material | - |
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| figurine | (noun) a small carved or molded figure | Synonyms: statuette |
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| fine | (noun) money extracted as a penalty | Synonyms: amercement, mulct |
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| firestone | (noun) a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns | - |
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| (noun) a piece of flint that is struck to light a fire | - |
| fishbone | (noun) a bone of a fish | - |
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| flagstone | (noun) stratified stone that splits into pieces suitable as paving stones | Synonyms: flag |
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| flavone | (noun) a colorless crystalline compound that is part of a number of white or yellow plant pigments | - |
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| fleabane | (noun) hairy perennial Eurasian herb with yellow daisylike flowers reputed to destroy or drive away fleas | Synonyms: feabane mullet, Pulicaria dysenterica |
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| (noun) any of several North American plants of the genus Erigeron having daisylike flowers; formerly believed to repel fleas | - |
| (noun) common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron | Synonyms: Canadian fleabane, Conyza canadensis, Erigeron canadensis, horseweed |
| flintstone | (noun) pebbles of flint used in masonry construction | - |
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| floatplane | (noun) a seaplane equipped with pontoons for landing or taking off from water | Synonyms: pontoon plane |
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| floxuridine | (noun) antineoplastic drug used to treat some cancers; can cause loss of hair | - |
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| fluoresceine | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluorescent dye, resorcinolphthalein |
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| fluorine | (noun) a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite | Synonyms: atomic number 9, F |
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| fluoxetine | (noun) a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade names Prozac or Sarafem); it is thought to work by increasing the activity of serotonin in the brain | Synonyms: fluoxetine hydrocholoride, Prozac, Sarafem |
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| fluphenazine | (noun) tranquilizer used to treat psychotic disorders | - |
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| fortune | (noun) an unknown and unpredictable phenomenon that causes an event to result one way rather than another | Synonyms: chance, hazard, luck |
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| (noun) an unknown and unpredictable phenomenon that leads to a favorable outcome | Synonyms: luck |
| (noun) a large amount of wealth or prosperity | - |
| (noun) your overall circumstances or condition in life (including everything that happens to you) | Synonyms: circumstances, destiny, fate, lot, luck, portion |
| 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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| 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 |
| 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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| 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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| 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 |
| 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. | - |
| headline | (noun) the heading or caption of a newspaper article | Synonyms: newspaper headline |
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| 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 |
| 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 | - |
| 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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| 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. | - |
| 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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