Definition of acephalic in US English:



  • 1Having or recognizing no ruler, head, or chief; leaderless.

  • 2Of a book, manuscript, or piece of writing: lacking a beginning.

  • 3Lacking a head, headless; (Medicine) of, relating to, or affected with acephaly.


Mid 17th century; earliest use found in Thomas Blount (1618–1679), antiquary and lexicographer. From classical Latin acephalus or its etymon ancient Greek ἀκέϕαλος + -ic. Compare post-classical Latin acephalicus.