- a member of the extinct genus Australopithecus.
- of, relating to, or resembling the genus Australopithecus or its members.
- any of various extinct apelike primates of the genus Australopithecus and related genera, remains of which have been discovered in southern and E Africa. Some species are estimated to be over 4.5 million years old
- of or relating to any of these primates
