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[kleyd] /kleɪd/
noun, Biology
a taxonomic group of organisms classified together on the basis of homologous features traced to a common ancestor.
Origin of clade
1957; < Greek kládos branch Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for clade


(biology) a group of organisms considered as having evolved from a common ancestor
Word Origin
C20: from Greek klados branch, shoot
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for clade

"group of organisms evolved from a common ancestor," 1957, from Greek klados "young branch, offshoot of a plant, shoot broken off," from PIE *kele-, possibly from root *kel- "to strike, cut" (see holt).

Online Etymology Dictionary, © 2010 Douglas Harper
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clade in Science
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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