from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Either of a pair of lateral hind fins of fishes, attached to the pelvic girdle.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun ichthyology Either of a pair of
finson either side and towards the rear of a fish.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun 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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