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[From New Latin Dipnoī, order name, from Greek dipnooi, pl. of dipnoos, having two apertures for breathing : di-, two; see di-1 + pnoē, breath (from pnein, to breathe; see pneu- in Indo-European roots).]
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.
(Animals) of, relating to, or belonging to the Dipnoi, a subclass of bony fishes comprising the lungfishes
(Animals) any lungfish
[C19: from New Latin Dipnoi, from Greek dipnoos, double-breathing, from di-1 + pnoē breathing, air, from pnein to breathe]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
dip•no•an(ˈdɪp noʊ ən)
1. belonging or pertaining to the order Dipnoi, comprising the lungfishes.n.
2. a dipnoan fish.
[1880–85; < New Latin Dipno(i), pl. of dipnous < Greek dípnoos double-breathing]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.