Definition of acraniate in English:

acraniate

adjective

Zoology
  • Lacking a skull or cranium; (formerly) specifically belonging to the subphylum Cephalochordata (formerly Acrania) of primitive vertebrates lacking braincases.

noun

Zoology
  • An acraniate organism; especially a cephalochordate.

Origin

Late 19th century; earliest use found in Canadian Journal. Either from a- + craniate, or from scientific Latin Acrania + -ate.

Pronunciation:

acraniate

/(ˌ)eɪˈkreɪnɪət/