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In page Clade:

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In biological phylogenetics, a clade (from Ancient Greek κλάδος (kládos) 'branch'), also known as a monophyletic group or natural group,[1] is a grouping of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree.[2] In the taxonomical literature, sometimes the Latin form cladus (plural cladi) is used rather than the English form.[citation needed] Clades are the fundamental unit of cladistics, a modern approach to taxonomy adopted by most biological fields.