crossopterygian

The story

From Crossopterygia + -an, Greek krossoí “tassels, fringe” + -o- + pterýgion “little wing or fin,” equivalent to pteryg- (stem of pterýx) “wing, fin” + -ion + -an.

First known use, by meaning

• from 19th c. Of or pertaining to the Crossopterygii, an infraclass of bony fish.