acephalic
/eɪsɪˈfalɪk/ /eɪkɛˈfalɪk/adjective
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.
Origin
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.