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Having or designating a tail fin in which the vertebral column extends to the tip, with symmetrical upper and lower parts, as in the lungfishes.

[Greek diphuēs, double; see diphyodont + kerkos, tail + -al.]

diph·y·cer′cy (-sûr′sē) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Zoology) ichthyol of or possessing a symmetrical or pointed tail with the vertebral column extending to the tip, as in primitive fishes
[C19: from Greek diphuēs twofold (from di1 + phuē growth) + kerkos tail]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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