Biology. consisting of organisms descended from a single taxon.

1870–75; mono- + phyletic

monophyletism [mon-uh-fahy-li-tiz-uhm, -fil-i-] , monophylety, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
monophyletic (ˌmɒnəʊfaɪˈlɛtɪk)
1.  relating to or characterized by descent from a single ancestral group of animals or plants
2.  (of animals or plants) of or belonging to a single stock

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American Heritage
Medical Dictionary

monophyletic mon·o·phy·let·ic (mŏn'ō-fī-lět'ĭk)

  1. Descended or derived from one original stock or source.

  2. Of or being the theory that all blood cells are derived from one common stem cell.

mon'o·phy'le·tism (-fī'lĭ-tĭz'əm) n.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
monophyletic  [%PREMIUM_LINK%]     (mŏn'ō-fī-lět'ĭk)  Pronunciation Key 
Relating to a taxonomic group that contains all the descendants of a single common ancestor. All clades, such as birds and placental mammals, are monophyletic. Compare paraphyletic, polyphyletic.

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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The arrangement of major snake groups herein reflects well-supported evolutionary divergence and monophyletic relationships.
All living birds share a common ancestor that would also be considered a bird, so they are a monophyletic group.
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