from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A group of organisms, such as a species, whose members share homologous features derived from a common ancestor.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A group of animals or other organisms derived from a common ancestor species.
- n. A higher level grouping of a genetic haplogroup.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a group of biological taxa or species that share features inherited from a common ancestor
From Greek klados, branch.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek κλάδος ("shoot, branch"). (Wiktionary)