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crossopterygian

[kro-sop-tuh-rij-ee-uh n] /krɒˌsɒp təˈrɪdʒ i ən/
noun
1.
any fish of the group Crossopterygii, extinct except for the coelacanth, regarded as being ancestral to amphibians and other land vertebrates.
adjective
2.
pertaining to or resembling a crossopterygian.
Origin
1860-1865
1860-65; < Neo-Latin Crossopterygi(i) group name (< Greek kross() tassels, fringe + -o- -o- + pterýgi(on) little wing or fin, equivalent to pteryg- (stem of pterýx) wing, fin + -ion diminutive suffix) + -an
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for crossopterygian

crossopterygian

/krɒˌsɒptəˈrɪdʒɪən/
noun
1.
any bony fish of the subclass Crossopterygii, having fleshy limblike pectoral fins. The group, now mostly extinct, contains the ancestors of the amphibians See also coelacanth
adjective
2.
of, relating to, or belonging to the Crossopterygii
Word Origin
C19: from New Latin Crossopterygiī, from Greek krossoi fringe, tassels + pterugion a little wing, from pterux wing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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crossopterygian in Science
crossopterygian
  (krŏ-sŏp'tə-rĭj'ē-ən)   
Any of a mostly extinct group of lobe-finned fishes of the order Crossopterygii, whose only living member is the coelacanth. One group of crossopterygians is thought to have evolved into terrestrial vertebrates beginning in the Devonian Period. See more at coelacanth.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for crossopterygian

any member of the subclass Crossopterygii, a group of primitive, lobe-finned, bony fishes believed to have given rise to the amphibians and all other land vertebrates. They appeared at the beginning of the Devonian Period (395,000,000 years ago) but are now represented only by the coelacanth (Latimeria chalumnae).

Learn more about crossopterygian with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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