Pronunciation: (boi-sā'), [key]
1. an extinct species of very rugged, large-toothed bipedal hominid, formerly known as Zinjanthropus boisei, that lived in eastern Africa one to two million years ago.
2. a fossil belonging to this species. See illus. under hominid.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.