Definitions for ventral fin
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Princeton's WordNet
pelvic fin, ventral fin(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
Wiktionary
ventral fin(Noun)
Fins located ventrally below the pectoral fins of a fish.
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"ventral fin." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/ventral fin>.

