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2 : TRANSITORY, PASSING

fly casting noun : the casting of artificial flies in fly-fishing or as a competitive sport

fly·catch·er noun : any of various passerine birds that feed on insects caught in flight

flyer variant of FLIER

fly–fish·ing noun : a method of fishing in which an artificial fly is used for bait

flying boat noun : a seaplane with a hull designed for floating

flying buttress noun : a projecting arched structure to support a wall or building

flying fish noun : any of numerous marine bony fishes capable of long gliding flights out of water by spreading their large fins like wings

flying saucer noun : an unidentified flying object reported to be saucer-shaped or disk-shaped

flying squirrel noun : either of two small nocturnal No. American squirrels with folds of skin connecting the forelegs and hind legs that enable them to make long gliding leaps

fly·leaf noun, plural fly·leaves : a blank leaf at the beginning or end of a book

fly·pa·per noun : paper poisoned or coated with a sticky substance for killing or catching flies

fly·speck noun 1 : a speck of fly dung

2 : something small and insignificant

Synonyms

atom, bit, crumb, fleck, grain, particle, speck

fly·way noun : an established air route of migratory birds

fly·wheel noun : a heavy wheel for regulating the speed of machinery

fm abbreviation fathom

Fm symbol fermium

FM noun : a broadcasting system using frequency modulation; also : a radio receiver of such a system

fn abbreviation footnote

fo or fol abbreviation folio

FO abbreviation foreign office

1foal noun : a young horse or related animal; especially : one under one year

2foal verb : to give birth to a foal

1foam noun 1 : a mass of bubbles formed on the surface of a liquid : FROTH, SPUME

2 : material (as rubber) in a lightweight cellular form

— foamy adjective

Synonyms

froth, head, lather, spume; also mousse; mist, spindrift, spray; scum

2foam verb : to form foam : FROTH

fob noun 1 : a short strap, ribbon, or chain attached esp. to a pocket watch

2 : a small ornament worn on a fob

FOB abbreviation free on board

fob off verb 1 : to put off with a trick, excuse, or inferior substitute

2 : to pass or offer as genuine

3 : to put aside

FOC abbreviation free of charge

focal length noun : the distance of a focus from a lens or curved mirror

fo'c'sle variant of FORECASTLE

1focus noun, plural fo·ci also fo·cus·es [ORIGIN: NL, fr. L, hearth]

1 : a point at which rays (as of light, heat, or sound) meet or diverge or appear to diverge; especially : the point at which an image is formed by a mirror, lens, or optical system

2 : FOCAL LENGTH

3 : adjustment (as of eyes or eyeglasses) that gives clear vision

4 : a central point : CENTER

— fo·cal adjective

— fo·cal·ly adverb

Synonyms

base, center, core, heart, hub, nucleus, seat—more at CENTER

2focus verb -cused also -cussed; -cus·ing also -cus·sing 1 : to bring or come to a focus <~ rays of light>

2 : to cause to be concentrated <~ attention on a problem>

3 : to adjust the focus of

Synonyms

concentrate, fasten, rivet, train—more at CONCENTRATE

fod·der noun 1 : coarse dry food (as cornstalks) for livestock

2 : available material used to supply a heavy demand

foe noun [ORIGIN: ME fo, fr. OE fāh, fr. fāh hostile]

: one who has personal enmity for another : ENEMY

Synonyms

adversary, antagonist, enemy, opponent—more at ENEMY

FOE abbreviation Fraternal Order of Eagles

foehn or föhn noun [ORIGIN: G Föhn]

: a warm dry wind blowing down a mountainside

foe·man noun : FOE

foe·tal, foe·tus chiefly British variant of FETAL, FETUS

1fog noun 1 : fine particles of water suspended in the lower atmosphere

2 : mental confusion

Synonyms

[1] haze, mist, murk, smog, soup—more at HAZE

[2] daze, haze, muddle, spin—more at HAZE

2fog verb fogged; fog·ging : to obscure or be obscured with or as if with fog

Synonyms

blur,