| eyestrain | (noun) a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem | Synonyms: asthenopia |
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| ferritin | (noun) a protein containing 20% iron that is found in the intestines and liver and spleen; it is one of the chief forms in which iron is stored in the body | - |
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| fetoprotein | (noun) any of several antigens that occur naturally in the fetus and sometimes in adults with cancer | Synonyms: foetoprotein |
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| fibrin | (noun) a white insoluble fibrous protein formed by the action of thrombin on fibrinogen when blood clots; it forms a network that traps red cells and platelets | - |
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| fibrinolysin | (noun) an enzyme that dissolves the fibrin of blood clots | Synonyms: plasmin |
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| filaggrin | (noun) the main protein of the keratohyalin granules | - |
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| fin | (noun) organ of locomotion and balance in fishes and some other aquatic animals | - |
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| (noun) a stabilizer on a ship that resembles the fin of a fish | - |
| (noun) one of a set of parallel slats in a door or window to admit air and reject rain | Synonyms: louver, louvre |
| (noun) a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater) | Synonyms: flipper |
| (noun) one of a pair of decorations projecting above the rear fenders of an automobile | Synonyms: tail fin, tailfin |
| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, five, fivesome, Little Phoebe, pentad, Phoebe, quint, quintet, quintuplet, V |
| firkin | (noun) a small wooden keg | - |
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| (noun) a British unit of capacity equal to 9 imperial gallons | - |
| flavin | (noun) a ketone that forms the nucleus of certain natural yellow pigments like riboflavin | - |
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| floodplain | (noun) a low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding | Synonyms: flood plain |
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| florin | (noun) formerly the basic unit of money in the Netherlands; equal to 100 cents | Synonyms: Dutch florin, guilder, gulden |
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| (noun) the basic unit of money in Suriname; equal to 100 cents | Synonyms: guilder, gulden |
| fluorescein | (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: fluoresceine, fluorescent dye, resorcinolphthalein |
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| fluvastatin | (noun) least expensive statin drug (trade name Lescol); usually taken orally at bedtime | Synonyms: Lescol |
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| foetoprotein | (noun) any of several antigens that occur naturally in the fetus and sometimes in adults with cancer | Synonyms: fetoprotein |
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| folacin | (noun) a B vitamin that is essential for cell growth and reproduction | Synonyms: folate, folic acid, pteroylglutamic acid, pteroylmonoglutamic acid, vitamin Bc, vitamin M |
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| forebrain | (noun) the anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube | Synonyms: prosencephalon |
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| foreskin | (noun) a fold of skin covering the tip of the penis | Synonyms: prepuce |
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| (noun) a fold of skin covering the tip of the clitoris | Synonyms: prepuce |
| formalin | (noun) a 10% solution of formaldehyde in water; used as a disinfectant or to preserve biological specimens | Synonyms: formol |
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| fountain | (noun) a plumbing fixture that provides a flow of water | Synonyms: fount |
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| (noun) an artificially produced flow of water | Synonyms: jet |
| (noun) a structure from which an artificially produced jet of water arises | - |
| (noun) a natural flow of ground water | Synonyms: natural spring, outflow, outpouring, spring |
| fradicin | (noun) an antibiotic obtained from an actinomycete and used (as a sulphate under the trade name Neobiotic) as an intestinal antiseptic in surgery | Synonyms: Neobiotic, neomycin |
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| franklin | (noun) a landowner (14th and 15th centuries) who was free but not of noble birth | - |
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| fusain | (noun) a stick of black carbon material used for drawing | Synonyms: charcoal |
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| gabapentin | (noun) an anticonvulsant (trade name Neurontin) used to control some types of seizures in the treatment of epilepsy; also used to manage neuralgia caused by shingles | Synonyms: Neurontin |
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| gain | (noun) the amount of increase in signal power or voltage or current expressed as the ratio of output to input | Synonyms: amplification |
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| (noun) the advantageous quality of being beneficial | Synonyms: profit |
| (noun) the amount by which the revenue of a business exceeds its cost of operating | - |
| (noun) a quantity that is added | Synonyms: addition, increase |
| gamin | (noun) (sometimes offensive) a homeless boy who has been abandoned and roams the streets | Synonyms: street arab, throwaway |
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| ganoin | (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: ganoine |
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| gaskin | (noun) lower part of a horse's thigh between the hock and the stifle | - |
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| gastrin | (noun) polypeptide hormone secreted by the mucous lining of the stomach; when peptides and amino acids are present in the small intestine the secretion of gastric acid is stimulated | - |
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| geartrain | (noun) wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed | Synonyms: gear, gearing, power train, train |
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| gegenschein | (noun) a faint spot of light in the night sky that appears directly opposite the position of the sun; a reflection of sunlight by micrometeoric material in space | Synonyms: counterglow |
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| gelatin | (noun) a thin translucent membrane used over stage lights for color effects | Synonyms: gel |
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| (noun) an edible jelly (sweet or pungent) made with gelatin and used as a dessert or salad base or a coating for foods | Synonyms: jelly |
| (noun) a colorless water-soluble glutinous protein obtained from animal tissues such as bone and skin | Synonyms: gelatine |
| gentamicin | (noun) an antibiotic (trade name Garamycin) that is derived from an actinomycete; used in treating infections of the urinary tract | Synonyms: Garamycin |
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| gherkin | (noun) small prickly cucumber | - |
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| (noun) any of various small cucumbers pickled whole | - |
| ghrelin | (noun) a gastrointestinal hormone produced by epithelial cells lining the fundus of the stomach; appears to be a stimulant for appetite and feeding, but is also a strong stimulant of growth hormone secretion from the anterior pituitary | - |
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| gibberellin | (noun) a plant hormone isolated from a fungus; used in promoting plant growth | - |
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| gin | (noun) a form of rummy in which a player can go out if the cards remaining in their hand total less than 10 points | Synonyms: gin rummy, knock rummy |
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| (noun) a machine that separates the seeds from raw cotton fibers | Synonyms: cotton gin |
| (noun) a trap for birds or small mammals; often has a slip noose | Synonyms: noose, snare |
| (noun) strong liquor flavored with juniper berries | - |
| globin | (noun) a colorless protein obtained by removing heme from hemoglobin; the oxygen carrying compound in red blood cells | Synonyms: haematohiston, hematohiston |
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| globulin | (noun) a family of proteins found in blood and milk and muscle and in plant seed | - |
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| glutelin | (noun) a simple protein found in the seeds of cereals | - |
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| glycerin | (noun) a sweet syrupy trihydroxy alcohol obtained by saponification of fats and oils | Synonyms: glycerine, glycerol |
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| glycerogelatin | (noun) a medicated skin preparation made from glycerin and glycerinated gelatin | Synonyms: glycerogel |
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| glycoprotein | (noun) a conjugated protein having a carbohydrate component | - |
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| goatskin | (noun) the hide of a goat | - |
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| goblin | (noun) (folklore) a small grotesque supernatural creature that makes trouble for human beings | Synonyms: hob, hobgoblin |
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| gonadotrophin | (noun) hormone secreted by the anterior pituitary gland and placenta; stimulates the gonads and controls reproductive activity | Synonyms: gonadotrophic hormone, gonadotropic hormone, gonadotropin |
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| gonadotropin | (noun) hormone secreted by the anterior pituitary gland and placenta; stimulates the gonads and controls reproductive activity | Synonyms: gonadotrophic hormone, gonadotrophin, gonadotropic hormone |
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| gorgerin | (noun) the molding at the top of a column | Synonyms: necking |
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| grain | (noun) the direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric | - |
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| (noun) the physical composition of something (especially with respect to the size and shape of the small constituents of a substance) | Synonyms: texture |
| (noun) the smallest possible unit of anything | - |
| (noun) foodstuff prepared from the starchy grains of cereal grasses | Synonyms: cereal, food grain |
| (noun) a relatively small granular particle of a substance | - |
| (noun) dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn | Synonyms: caryopsis |
| (noun) a cereal grass | - |
| (noun) 1/7000 pound; equals a troy grain or 64.799 milligrams | - |
| (noun) 1/60 dram; equals an avoirdupois grain or 64.799 milligrams | - |
| (noun) a weight unit used for pearls or diamonds: 50 mg or 1/4 carat | Synonyms: metric grain |
| (noun) the side of leather from which the hair has been removed | - |
| gramicidin | (noun) an antibiotic produced by a soil bacterium; used chiefly as an antiseptic in treating local infections produced by Gram-positive bacteria | - |
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| gremlin | (noun) (folklore) fairies that are somewhat mischievous | Synonyms: brownie, elf, hob, imp, pixie, pixy |
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| griffin | (noun) winged monster with the head of an eagle and the body of a lion | Synonyms: griffon, gryphon |
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| grin | (noun) a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement | Synonyms: grinning, smile, smiling |
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| griseofulvin | (noun) a kind of penicillin (a fungicidal antibiotic with the trade name Fulvicin) produced by molds of the genus Penicillium | Synonyms: Fulvicin |
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| groin | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: breakwater, bulwark, groyne, jetty, mole, seawall |
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| (noun) a curved edge formed by two intersecting vaults | - |
| (noun) the crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals | Synonyms: inguen |
| grosgrain | (noun) a silk or silklike fabric with crosswise ribs | - |
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| haematoidin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: bilirubin, hematoidin |
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| haemitin | (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds | Synonyms: haem, hematin, heme, protoheme |
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| haemoglobin | (noun) a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues | Synonyms: Hb, hemoglobin |
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| haemolysin | (noun) any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin | Synonyms: erythrocytolysin, erythrolysin, hemolysin |
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| haemoprotein | (noun) a conjugated protein linked to a compound of iron and porphyrin | Synonyms: hemoprotein |
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| haemosiderin | (noun) a granular brown substance composed of ferric oxide; left from the breakdown of hemoglobin; can be a sign of disturbed iron metabolism | Synonyms: hemosiderin |
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| hairpin | (noun) a double pronged pin used to hold women's hair in place | - |
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| handbasin | (noun) a basin for washing the hands | Synonyms: lavabo, wash-hand basin, washbasin, washbowl |
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| haptoglobin | (noun) a protein in plasma that binds free hemoglobin and removes it (as from wounds) | - |
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| harlequin | (noun) a clown or buffoon (after the Harlequin character in the commedia dell'arte) | - |
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| hatpin | (noun) a long sturdy pin used by women to secure a hat to their hair | - |
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| headpin | (noun) the front bowling pin in the triangular arrangement of ten pins | Synonyms: kingpin |
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| hematin | (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds | Synonyms: haem, haemitin, heme, protoheme |
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| hematoidin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: bilirubin, haematoidin |
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| hemin | (noun) a reddish-brown chloride of heme; produced from hemoglobin in laboratory tests for the presence of blood | Synonyms: protohemin |
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| hemoglobin | (noun) a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues | Synonyms: haemoglobin, Hb |
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| hemolysin | (noun) any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin | Synonyms: erythrocytolysin, erythrolysin, haemolysin |
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| hemoprotein | (noun) a conjugated protein linked to a compound of iron and porphyrin | Synonyms: haemoprotein |
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| hemosiderin | (noun) a granular brown substance composed of ferric oxide; left from the breakdown of hemoglobin; can be a sign of disturbed iron metabolism | Synonyms: haemosiderin |
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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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| hepatoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: lactoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| hepatotoxin | (noun) any toxin that affects the liver | - |
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| heroin | (noun) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush | Synonyms: diacetylmorphine |
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| hin | (noun) ancient Hebrew unit of liquid measure = 1.5 gallons | - |
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| hindbrain | (noun) the posterior portion of the brain including cerebellum and brainstem | Synonyms: rhombencephalon |
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| hoactzin | (noun) crested ill-smelling South American bird whose young have claws on the first and second digits of the wings | Synonyms: hoatzin, Opisthocomus hoazin, stinkbird |
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| hoatzin | (noun) crested ill-smelling South American bird whose young have claws on the first and second digits of the wings | Synonyms: hoactzin, Opisthocomus hoazin, stinkbird |
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| hobgoblin | (noun) an object of dread or apprehension | Synonyms: bugbear |
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| (noun) (folklore) a small grotesque supernatural creature that makes trouble for human beings | Synonyms: goblin, hob |
| humin | (noun) a black humic substance that is not soluble in water | - |
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| hyalin | (noun) a glassy translucent substance that occurs in hyaline cartilage or in certain skin conditions | Synonyms: hyaline |
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| hydantoin | (noun) any of a group of anticonvulsant drugs used in treating epilepsy | - |
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| immunoglobulin | (noun) a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response | Synonyms: Ig, immune gamma globulin, immune globulin, immune serum globulin |
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| in | (noun) a unit of length equal to one twelfth of a foot | Synonyms: inch |
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| indigotin | (noun) a blue dye obtained from plants or made synthetically | Synonyms: anil, indigo |
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| indomethacin | (noun) a nonsteroidal anti-inflammatory drug (trade name Indocin) | Synonyms: Indocin |
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| insulin | (noun) hormone secreted by the isles of Langerhans in the pancreas; regulates storage of glycogen in the liver and accelerates oxidation of sugar in cells | - |
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| interbrain | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, diencephalon, thalmencephalon |
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| interleukin | (noun) any of several lymphokines that promote macrophages and killer T cells and B cells and other components of the immune system | - |
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| inulin | (noun) used to manufacture fructose and in assessing kidney function | - |
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| iodin | (noun) a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks) | Synonyms: atomic number 53, I, iodine |
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| iodochlorhydroxyquin | (noun) drug used to treat certain fungal infection (as athlete's foot) | Synonyms: Clioquinol |
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| iodoprotein | (noun) a protein that contains iodine | Synonyms: iodinated protein |
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| iodopsin | (noun) a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision | - |
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| isoagglutinin | (noun) an antibody produced by one individual that causes agglutination of red blood cells in other individuals of the same species | - |
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| javelin | (noun) a spear thrown as a weapon or in competitive field events | - |
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| (noun) an athletic competition in which a javelin is thrown as far as possible | - |