from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A fin, such as a pelvic fin or an anal fin, that is found on the ventral side of a fish.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fin, usually paired, located ventrally below the pectoral fins of a fish.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate


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