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Of or relating to a group of organisms containing taxa descended from two different ancestral lines.
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.
(Biology) relating to or characterized by descent from two ancestral groups of animals or plants
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
di•phy•let•ic(ˌdaɪ faɪˈlɛt ɪk)
of or pertaining to a taxonomic group of organisms derived from two separate ancestral lines.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.