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flyspeck a small spot or speck made by a fly's excrement. [3 definitions]
fly swatter a device for killing insects, particularly flies, consisting of a flat rectangular mesh attached to a long handle.
fly the coop (informal) to escape from or as if from confinement.
flytrap a plant that traps insects, such as the Venus flytrap.
flyway a specific air route taken regularly by birds on their semiannual migrations to and from their breeding grounds.
flyweight a boxer who weighs 112 pounds or less and thus qualifies to compete in the lightest official weight class.
flywheel a heavy-rimmed wheel that rotates on a shaft and with its momentum serves to minimize variation in the speed of machinery connected to the shaft.
FM a system of varying a radio signal's frequency so as to impose the signal on a carrier wave; frequency modulation. [2 definitions]
Fm symbol of the chemical element fermium.
FNMA abbreviation of "Federal National Mortgage Association;" Fannie Mae.
f-number the relative aperture of a camera lens, representing the light it will transmit, which is obtained by dividing the focal length of the lens by the diameter of the aperture.
foal a young horse, mule, or related animal, esp. under one year old. [2 definitions]
foam a usu. whitish mass of small bubbles that forms on the surface of a liquid after agitation, fermentation, or the like; froth. [6 definitions]
foamable combined form of foam.
foamless combined form of foam.
foam rubber a firm, lightweight spongy rubber, used esp. in upholstered seats and for mattresses.
foamy made of, full of, or covered with foam. [2 definitions]
fob1 a short chain, strap, or ribbon usu. connected to a pocket watch, or a small ornament or medallion attached to the chain, strap, or ribbon. [2 definitions]
fob2 to dispose of (an item or items) in a deceitful way (usu. fol. by off). [2 definitions]
focal of or relating to focus.
focalize in medicine, to limit or be limited to a specific area, as an infection; localize.