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flying gunnard any of several mostly tropical marine fishes with colorful winglike pectoral fins that enable them to glide above the water for short distances.
flying jib a small, light, triangular sail mounted out beyond the jib, usu. on an extension of the jib boom.
flying saucer any of various bright disk-shaped objects occasionally seen hovering or flying at high altitudes, often presumed to be spacecraft from another world; UFO.
flying squirrel a squirrel with winglike membranes connecting the forelegs to the hind legs, that enable it to make long gliding leaps through the air.
flying start a quick start or beginning, as in a race, project, or the like. [2 definitions]
fly in the face of to defy (authority, convention, or the like).
flyleaf the blank sheet or leaf in the front or back of a book.
fly off the handle to become suddenly enraged.
flypaper paper with a sticky, sometimes poisonous coating, often hung in narrow strips from the ceiling, to catch and kill flies.
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]