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caudal keel

noun

Definitions

  1. A lateral ridge found just anterior to each side of the tail fin on the caudal peduncle…

    A lateral ridge found just anterior to each side of the tail fin on the caudal peduncle of some types of fast-swimming fish. The keels improve the stability of the fish's attitude at speed in the water, and strengthen the support of the caudal fin.

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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA