fin 1
(fĭn)
(fĭn)n.
1. A membranous appendage extending from the body of a fish or other aquatic animal, used for propelling, steering, or balancing the body in the water.
2. Something resembling a fin in shape or function, as:
a. A covering for the foot having a flat flexible portion made of rubber or plastic that widens as it extends forward from the toes, used to provide enhanced propulsion in swimming and diving.Also called flipper.
b. A fixed or movable airfoil used to stabilize an aircraft, missile, or projectile in flight.
c. A thin, usually curved projection attached to the rear bottom of a surfboard for stability.
d. A projecting vane used for cooling, as on a radiator or an engine cylinder.
e. See tail fin.
v.finned, fin·ning, fins
v.tr.
To equip with fins.
v.intr.
1. To emerge with the fins above water.
2. To swim, as a fish.
3. To lash the water with the fins. Used of a dying whale.
[Middle English, fromOld Englishfinn.]
fin1top: fins of a typical bony fish
bottom: swimming fins
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