The Collaborative International Dictionary
Acephal
Acephal \Ac"e*phal\, n. [Gr. ?; 'a priv. + ? head: cf. F. ac['e]phale, LL. acephalus.] (Zo["o]l.) One of the Acephala. [1913 Webster] ||
Wiktionary
acephal
n. (context zoology English) One of the Acephala.