Definition of autapomorphic in English:

autapomorphic

Pronunciation /ˌɔːtəpəˈmɔːfɪk/

adjective

  • Designating or relating to a novel characteristic that has evolved in only one species or lineage within a taxon.

Origin

1970s; earliest use found in Systematic Zoology. From auto- + apomorphic, after autapomorphy.