Definition of clade in US English:

clade

noun

Biology
  • A group of organisms believed to have evolved from a common ancestor, according to the principles of cladistics.

    • ‘The monilophytes refers to the monophyletic clade of horsetails and ferns.’
    • ‘Was survival of the various clades through various biotic crises just a matter of luck?’
    • ‘Species in the two primary clades in the genus tend to be found in different parts of North America.’
    • ‘Fossils are often not ancestors of extant taxa, but instead may be extinct sister groups to modern taxa or clades.’
    • ‘The same mode of increase has been adopted independently in phylogenetically distinct clades.’

Origin

1950s: from Greek klados ‘branch’.

Pronunciation

clade

/klād/