noun. a group of biological taxa or species that share features inherited from a common ancestor.
1. Noun, singular or mass Among the largest species of the clade, the orange-colored Tropidophis melanurus reaches almost 3 feet in length; most of the other species are less than half of this length. 2. Adjective He argued that species should be identified and classified based on genetics and clade relationships, particularly monophyletic groups.