Any of several extinct hominids, belonging to the genera Australopithecus, Paranthropus when seen as distinct, and sometimes other closely related genera.
User Defined Definitions
"any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago"
"of or belonging to the hominid genus Australopithecus"