fin

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fin

(fĭn)
n.
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.

fin

a flattened limb found in aquatic animals, and used for locomotion.

fin

winglike structure attached to the body of fish and cetaceans; used for steering and propulsion during progress through the water.

fin rot
a disease of aquarium fish characterized by thickening followed by necrosis of the fin and tail tissues, commencing at the edges, caused by Haemophilus piscum and Aeromonas spp. May be bracketed with fin rot/tail rot/snout erosion. Often associated with suboptimal cultural conditions. Mixed populations of opportunistic bacteria are usually present.