/boy say"/
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 .
[ boisei after Charles Boise, a benefactor of L.S.B. Leakey, who described and named the original finds in 1959 ]