fluxmeter
- n meter that measures magnetic flux by the current it generates in a coil
fly-by
- n a flight at a low altitude (usually of military aircraft) over spectators on the ground
fly-fishing
- n angling with an artificial fly as a lure
- v fish with flies as lures
fly agaric
- n poisonous (but rarely fatal) woodland fungus having a scarlet cap with white warts and white gills
fly ash
- n fine solid particles of ash that are carried into the air when fuel is combusted