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The Collaborative International Dictionary
Crossopterygian

Crossopterygian \Cros*sop`ter*yg"i*an\ (kr?s-s?p`t?r-?j?-an), a. (Zo["o]l.) Of or pertaining to the Crossopterygii. -- n. One of the Crossopterygii. [1913 Webster] ||

Wiktionary
crossopterygian

a. (context zoology English) Of or pertaining to the Crossopterygii. n. (context zoology English) One of the Crossopterygii.

WordNet
crossopterygian

n. any fish of the order Crossopterygii; most known only in fossil form [syn: lobefin, lobe-finned fish]