Definition of Homo erectus

Homo erectus: A primate believed to have been an extinct ancestor of modern humans being (Homo sapiens). Known to have been tall (average 1.78 m or 5 feet, 10 inches), erect stature, smaller brain (about 75% the size of Homo sapiens), and a lower forehead than modern humans. Homo erectus is Latin for erect or upright man.