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clade (n.)

"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).

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Definitions of clade from WordNet

clade (n.)
a group of biological taxa or species that share features inherited from a common ancestor;
From wordnet.princeton.edu