monophyletic mon·o·phy·let·ic (mŏn'ō-fī-lět'ĭk)
Descended or derived from one original stock or source.
Of or being the theory that all blood cells are derived from one common stem cell.
Relating to a taxonomic group that contains all the descendants of a single common ancestor. All clades, such as birds and placental mammals, are monophyletic. Compare paraphyletic, polyphyletic.