noun Biology.
a taxonomic group of organisms classified together on the basis of homologous features traced to a common ancestor.

1957; < Greek kládos branch Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clade (kleɪd)
biology a group of organisms considered as having evolved from a common ancestor
[C20: from Greek klados branch, shoot]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"group of organisms evolved from a common ancestor," 1957, from Gk. klados "young branch, offshoot of a plant" (see cladism).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
clade   (klād)  Pronunciation Key 
A grouping of organisms made on the basis of phylogenetic relationship, rather than purely on shared features. Clades consist of a common ancestor and all its descendants. The class Aves (birds) is a clade, whereas the class Reptilia (reptiles) is not, since it does not include birds, which are descended from the dinosaurs, a kind of reptile. Many modern taxonomists prefer to use clades in classification, and not all clades correspond to traditional groups like classes, orders, and phyla. Compare grade.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Actually, it indicated that they weren't a clade at all.
They share this venom clade with various other saurian species.
A clade or species located within another clade is said to be nested within that clade.
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