| fantabulous | (adjective) very good; of the highest quality | Synonyms: excellent, first-class, mean, ripping, splendid |
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| farinaceous | (adjective) composed of or covered with particles resembling meal in texture or consistency | Synonyms: coarse-grained, grainy, granular, granulose, gritty, mealy |
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| (adjective) resembling starch | Synonyms: amylaceous, amyloid, amyloidal, starchlike |
| fasciculus | (noun) a bundle of fibers (especially nerve fibers) | Synonyms: fascicle, fiber bundle, fibre bundle |
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| fastidious | (adjective) giving careful attention to detail; hard to please; excessively concerned with cleanliness | - |
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| (adjective) having complicated nutritional requirements; especially growing only in special artificial cultures | Synonyms: exacting |
| fatuous | (adjective) extremely silly or stupid | Synonyms: asinine, inane |
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| favus | (noun) a contagious fungal infection of the scalp; occurs mainly in Africa and the Middle East | - |
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| felicitous | (adjective) exhibiting an agreeably appropriate manner or style | - |
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| (adjective) marked by good fortune | Synonyms: happy |
| felonious | (adjective) involving or being or having the nature of a crime | Synonyms: criminal |
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| ferocious | (adjective) marked by extreme and violent energy | Synonyms: fierce, furious, savage |
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| ferrous | (adjective) of or relating to or containing iron | Synonyms: ferric |
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| fetus | (noun) an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal | Synonyms: foetus |
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| feverous | (adjective) having or affected by a fever | Synonyms: feverish |
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| fibrinous | (adjective) characterized by the presence of fibrin | - |
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| fibrocartilaginous | (adjective) of or relating to fibrocartilage | - |
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| fibrous | (adjective) (of meat) full of sinews; especially impossible to chew | Synonyms: sinewy, stringy, unchewable |
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| (adjective) having or resembling fibers especially fibers used in making cordage such as those of jute | Synonyms: hempen |
| fictitious | (adjective) adopted in order to deceive | Synonyms: assumed, false, fictive, pretended, put on, sham |
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| (adjective) formed or conceived by the imagination | Synonyms: fabricated, fancied, fictional |
| filamentous | (adjective) thin in diameter; resembling a thread | Synonyms: filamentlike, filiform, threadlike, thready |
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| filovirus | (noun) animal viruses belonging to the family Filoviridae | - |
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| fissiparous | (adjective) reproducing by fission | - |
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| (adjective) having separated or advocating separation from another entity or policy or attitude | Synonyms: breakaway, separatist |
| fistulous | (adjective) of or pertaining to or resembling a fistula | - |
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| (adjective) hollow and tube-shaped like a reed | Synonyms: fistular, fistulate |
| flagitious | (adjective) shockingly brutal or cruel | Synonyms: atrocious, grievous, monstrous |
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| (adjective) extremely wicked, deeply criminal | Synonyms: heinous |
| flatus | (noun) a reflex that expels intestinal gas through the anus | Synonyms: breaking wind, fart, farting, wind |
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| flavivirus | (noun) animal viruses belonging to the family Flaviviridae | - |
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| flavorous | (adjective) full of flavor | Synonyms: flavorful, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavourous | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourful, flavoursome, sapid, saporous |
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| flexuous | (adjective) having turns or windings | - |
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| flirtatious | (adjective) like a coquette | Synonyms: coquettish |
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| focus | (noun) maximum clarity or distinctness of an image rendered by an optical system | - |
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| (noun) maximum clarity or distinctness of an idea | - |
| (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focusing, focussing |
| (noun) a fixed reference point on the concave side of a conic section | - |
| (noun) a point of convergence of light (or other radiation) or a point from which it diverges | Synonyms: focal point |
| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, nidus |
| (noun) special emphasis attached to something | Synonyms: stress |
| (verb) become focussed or come into focus | Synonyms: focalise, focalize |
| (verb) put (an image) into focus | Synonyms: focalise, focalize, sharpen |
| (verb) direct one's attention on something | Synonyms: center, centre, concentrate, pore, rivet |
| (verb) bring into focus or alignment; to converge or cause to converge; of ideas or emotions | Synonyms: concenter, concentre, focalise, focalize |
| (verb) cause to converge on or toward a central point | - |
| foetus | (noun) an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal | Synonyms: fetus |
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| foliaceous | (adjective) of or pertaining to or resembling the leaf of a plant | - |
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| (adjective) bearing numerous leaves | Synonyms: foliaged, foliose |
| (adjective) (especially of metamorphic rock) having thin leaflike layers or strata | Synonyms: foliate, foliated |
| fortuitous | (adjective) occurring by happy chance | - |
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| (adjective) having no cause or apparent cause | Synonyms: causeless, uncaused |
| fossiliferous | (adjective) bearing or containing fossils | - |
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| fractious | (adjective) unpredictably difficult in operation; likely to be troublesome | - |
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| (adjective) stubbornly resistant to authority or control | Synonyms: recalcitrant, refractory |
| (adjective) easily irritated or annoyed | Synonyms: cranky, irritable, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
| frivolous | (adjective) not serious in content or attitude or behavior | - |
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| fucus | (noun) any member of the genus Fucus | - |
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| fugacious | (adjective) lasting a very short time | Synonyms: ephemeral, passing, short-lived, transient, transitory |
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| fulgurous | (adjective) amazingly impressive; suggestive of the flashing of lightning | Synonyms: dazzling, eye-popping, fulgurant |
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| fundus | (noun) (anatomy) the base of a hollow organ or that part of the organ farthest from its opening | - |
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| fungous | (adjective) of or relating to fungi | Synonyms: fungal |
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| fungus | (noun) an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia | - |
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| funiculus | (noun) any of several body structure resembling a cord | - |
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| (noun) the stalk of a plant ovule or seed | Synonyms: funicle |
| furious | (adjective) marked by extreme anger | Synonyms: angered, enraged, infuriated, maddened |
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| (adjective) (of the elements) as if showing violent anger | Synonyms: angry, raging, tempestuous, wild |
| (adjective) marked by extreme and violent energy | Synonyms: ferocious, fierce, savage |
| fuscous | (adjective) of something having a dusky brownish grey color | Synonyms: taupe |
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| galbulus | (noun) the seed-producing cone of a cypress tree | - |
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| gallinaceous | (adjective) of or relating to or resembling a gallinacean | - |
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| gallous | (noun) alternative terms for gallows | Synonyms: gallows-tree, gallows tree, gibbet |
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| gallus | (noun) elastic straps that hold trousers up | Synonyms: brace, suspender |
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| gamopetalous | (adjective) having a corolla composed of partially or wholly fused petals forming a corolla shaped like a tube or funnel | Synonyms: sympetalous |
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| gangrenous | (adjective) suffering from tissue death | Synonyms: mortified |
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| garrulous | (adjective) full of trivial conversation | Synonyms: chatty, gabby, loquacious, talkative, talky |
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| gaseous | (adjective) existing as or having characteristics of a gas | - |
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| gastrocnemius | (noun) the muscle in the back part of the leg that forms the greater part of the calf; responsible for the plantar flexion of the foot | Synonyms: gastrocnemius muscle |
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| gelatinous | (adjective) thick like gelatin | Synonyms: gelatinlike, jellylike |
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| gemmiferous | (adjective) bearing or reproducing by a gemma | - |
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| generous | (adjective) willing to give and share unstintingly | - |
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| (adjective) not petty in character and mind | - |
| (adjective) more than is usual or necessary | - |
| genius | (noun) exceptional creative ability | Synonyms: wizardry |
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| (noun) a natural talent | Synonyms: flair |
| (noun) unusual mental ability | Synonyms: brilliance |
| (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, brainiac, Einstein, mastermind |
| (noun) someone who is dazzlingly skilled in any field | Synonyms: ace, adept, champion, hotshot, maven, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard |
| genus | (noun) a general kind of something | - |
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| (noun) (biology) taxonomic group containing one or more species | - |
| geosynchronous | (adjective) of or having an orbit with a fixed period of 24 hours (although the position in the orbit may not be fixed with respect to the earth) | - |
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| gibbous | (adjective) (used of the moon) more than half full | Synonyms: gibbose |
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| (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, humpbacked, humped, hunchbacked, kyphotic |
| ginglymus | (noun) a freely moving joint in which the bones are so articulated as to allow extensive movement in one plane | Synonyms: ginglymoid joint, hinge joint |
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| glabrous | (adjective) having no hair or similar growth; smooth | - |
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| gladiolus | (noun) the large central part of the breastbone | Synonyms: corpus sternum |
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| (noun) any of numerous plants of the genus Gladiolus native chiefly to tropical and South Africa having sword-shaped leaves and one-sided spikes of brightly colored funnel-shaped flowers; widely cultivated | Synonyms: glad, gladiola, sword lily |
| glamorous | (adjective) having an air of allure, romance and excitement | Synonyms: glamourous |
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| glamourous | (adjective) having an air of allure, romance and excitement | Synonyms: glamorous |
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| glaucous | (adjective) having a frosted look from a powdery coating, as on plants | - |
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| glomerulus | (noun) a small intertwined group of capillaries in the malpighian body; it filters the blood during urine formation | - |
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| glorious | (adjective) having or deserving or conferring glory | - |
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| (adjective) having great beauty and splendor | Synonyms: resplendent, splendid, splendiferous |
| (adjective) characterized by grandeur | Synonyms: brilliant, magnificent, splendid |
| gluteus | (noun) any one of three large skeletal muscles that form the buttock and move the thigh | Synonyms: glute, gluteal muscle, gluteus muscle |
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| glutinous | (adjective) having the sticky properties of an adhesive | Synonyms: gluey, gummy, mucilaginous, pasty, sticky, viscid, viscous |
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| gluttonous | (adjective) given to excess in consumption of especially food or drink | - |
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| gonococcus | (noun) the pus-producing bacterium that causes gonorrhea | Synonyms: Neisseria gonorrhoeae |
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| gorgeous | (adjective) dazzlingly beautiful | - |
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| gracious | (adjective) characterized by charm, good taste, and generosity of spirit | - |
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| (adjective) characterized by kindness and warm courtesy especially of a king to his subjects | Synonyms: benignant |
| (adjective) exhibiting courtesy and politeness | Synonyms: courteous, nice |
| (adjective) disposed to bestow favors | - |
| grampus | (noun) slaty-grey blunt-nosed dolphin common in northern seas | Synonyms: Grampus griseus |
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| (noun) predatory black-and-white toothed whale with large dorsal fin; common in cold seas | Synonyms: killer, killer whale, orca, Orcinus orca, sea wolf |
| granuliferous | (adjective) producing or full of granules | - |
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| granulomatous | (adjective) relating to or characterized by granulomas | - |
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| gratuitous | (adjective) without cause | - |
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| (adjective) unnecessary and unwarranted | Synonyms: needless, uncalled-for |
| (adjective) costing nothing | Synonyms: complimentary, costless, free, gratis |
| gregarious | (adjective) (of animals) tending to form a group with others of the same species | - |
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| (adjective) (of plants) growing in groups that are close together | - |
| (adjective) instinctively or temperamentally seeking and enjoying the company of others | - |
| grievous | (adjective) causing fear or anxiety by threatening great harm | Synonyms: dangerous, grave, life-threatening, serious, severe |
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| (adjective) shockingly brutal or cruel | Synonyms: atrocious, flagitious, monstrous |
| (adjective) of great gravity or crucial import; requiring serious thought | Synonyms: grave, heavy, weighty |
| (adjective) causing or marked by grief or anguish | Synonyms: heartbreaking, heartrending |
| grumous | (adjective) transformed from a liquid into a soft semisolid or solid mass | Synonyms: coagulate, coagulated, curdled, grumose |
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| gumptious | (adjective) working hard to promote an enterprise | Synonyms: energetic, industrious, up-and-coming |
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| gymnospermous | (adjective) relating to or characteristic of plants of the class Gymnospermae | - |
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| gynandromorphous | (adjective) having both male and female morphological characteristics | Synonyms: gynandromorphic |
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| gyrus | (noun) a convex fold or elevation in the surface of the brain | Synonyms: convolution |
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| habitus | (noun) constitution of the human body | Synonyms: body-build, build, physique |
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| (noun) person's predisposition to be affected by something (as a disease) | - |
| 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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| halitus | (noun) exhaled breath | Synonyms: exhalation |
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| harmonious | (adjective) musically pleasing | - |
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| (adjective) exhibiting equivalence or correspondence among constituents of an entity or between different entities | Synonyms: proportionate, symmetrical |
| (adjective) existing together in harmony | - |
| (adjective) suitable and fitting | - |
| harquebus | (noun) an obsolete firearm with a long barrel | Synonyms: arquebus, hackbut, hagbut |
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| hazardous | (adjective) involving risk or danger | Synonyms: risky, wild |
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| heinous | (adjective) extremely wicked, deeply criminal | Synonyms: flagitious |
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| helianthus | (noun) any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays | Synonyms: sunflower |
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| hemimetabolous | (adjective) (of an insect with aquatic young) undergoing incomplete metamorphosis in which the young does not resemble the adult | Synonyms: hemimetabolic, hemimetamorphic, hemimetamorphous |
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| hemimetamorphous | (adjective) (of an insect with aquatic young) undergoing incomplete metamorphosis in which the young does not resemble the adult | Synonyms: hemimetabolic, hemimetabolous, hemimetamorphic |
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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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| herbaceous | (adjective) characteristic of a nonwoody herb or plant part | - |
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| herbivorous | (adjective) feeding only on plants | - |
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| herrerasaurus | (noun) a kind of theropod dinosaur found in Argentina | Synonyms: herrerasaur |
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| heteroecious | (adjective) of parasites; passing through different stages of the life cycle on different host species | - |
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| heterogeneous | (adjective) consisting of elements that are not of the same kind or nature | Synonyms: heterogenous |
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| (adjective) originating outside the body | Synonyms: heterogenous |