| flibbertigibbet | n. | gossip; flighty woman | ||
| flinders | n. | small pieces, splinters | ||
| flirt | n. | sudden jerk, quick throw | ||
| flitch | n. | side of bacon; square of whale blubber; halibut steak; lengthwise cut plank of wood | ||
| floccillation | n. | delirious picking at bedclothes, carphology | ||
| floccule | n. | thing resembling a small tuft of wool | ||
| flocculus | n. | dark or light patch on the surface of the sun | ||
| Florida water | n. | Cologne water developed in U.S. in early 19th century, with a distinctive spicy orange scent | ||
| florin | n. | former British coin worth two shillings; gold coin of the city-state of Florence | ||
| flounce | v. | to move in exaggeratedly impatient or angry manner; to make overdramatic movements; to decorate with pleated trimming | ||
| flummery | n. | mere trifling, empty compliment; dish made from oatmeal or flour boiled with water until thick | ||
| flump | v. | to fall or move heavily with a thump | ||
| flytime | n. | season when flies are prevalent and pestering | ||
| foehn | n. | dry warm wind blowing downhill in the Alps, esp. in Switzerland | ||
| foetor | n. | stench, offensive smell (also fetor) | ||
| fog | n. | long and thickly growing grass | ||
| foible | n. | minor quirk or idiosyncrasy; weakness of character; weaker half of sword blade (between middle and the point) | ||
| foin | v. | to thrust or to lunge with a weapon | ||
| foison | n. | plenty, abundance; plentiful harvest; vitality | ||
| foist | v. | to impose an unwanted thing upon, to palm off | ||
| folie à deux | n. | delusion shared by a couple | ||
| foliiferous | adj. | bearing leaves | ||
| folletto | n. | imp, fairy | ||
| foment | v. | to incite, to encourage; to apply heat or ointment to (body part) | ||
| fomes | n. | objects which may carry infectious organisms after contact with contagious individual (pl. fomites) | ||
| fons et origo | n. | source and origin | Latin | |
| fontanel | n. | space between bones of the not fully sutured skull of an infant or fetus | ||
| fontange | n. | high headdress formed of starched cotton and ribbons, worn by upper classes in 17th and 18th Century Europe | ||
| foot up | v. | to total a bill at its bottom | ||
| footling | adj. | blithering, foolish, silly | ||
| footy | adj. | paltry, worthless | ||
| foozle | v. | to bungle, esp. in golf | ||
| forcemeat | n. | ground or sieved meat mixed with fat and sometimes flavoring or vegetables for use in various recipes | ||
| forearm | v. | to arm beforehand | ||
| forehanded | adj. | prudent; resilient | ||
| foreland | n. | headland, promontory; land adjacent to mountains where material has been deposited from the peaks by action of plate tectonics | ||
| foremother | n. | female ancestor; female predecessor | ||
| foreweary | v. | to make tired at an earlier time | ||
| forfend | v. | to protect by precautionary measures; to prevent, to fend off | ||
| forgather | v. | to gather together, to assemble | ||
| formication | n. | sensation as if ants are crawling on one’s skin | ||
| fornenst | prep. | next to; facing | ||
| forritsome | adj. | impudent, forward | Scots | |
| forsooth | adv. | indeed, in fact | archaic | |
| fortalice | n. | a small fort; (archaic) fortress | ||
| forte | n. | specialty or exceptional ability of a person | ||
| fosse | n. | ditch, trench; defensive moat used around a fortification | ||
| fossick | n. | to search for gold in abandoned diggings; to hunt about | ||
| foulard | n. | lightweight cloth of silk or silk and cotton, often with printed design | ||
| fox | v. | to discolor, to become spotted |
