Dictionary![]() ![]() cros•sop•te•ryg•i•anPronunciation: (kro-sop"tu-rij'ē-un), [key] —n. any fish of the group Crossopterygii, extinct except for the coelacanth, regarded as being ancestral to amphibians and other land vertebrates. —adj. pertaining to or resembling a crossopterygian. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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