flinthead
- n an American stork that resembles the true ibises in having a downward-curved bill; inhabits wooded swamps of New World tropics
flintlock
- n a muzzle loader that had a flintlock type of gunlock
- n an obsolete gunlock that has flint embedded in the hammer; the flint makes a spark that ignites the charge
flip-flop
- n a decision to reverse an earlier decision
- n a backless sandal held to the foot by a thong between the big toe and the second toe
- n an electronic circuit that can assume either of two stable states
- n a backward somersault
- v reverse (a direction, attitude, or course of action)
flip chart
- n a chart with several sheets hinged at the top; sheets can be flipped over to present information sequentially
flip side
- n a different aspect of something (especially the opposite aspect)
flipper
- n a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
- n the flat broad limb of aquatic animals specialized for swimming