1 headless.
2 having no chief.
3 Zool. having no part of the body specially organized as a head.
4 Bot. with a head aborted or cut off.
5 Prosody lacking a syllable or syllables in the first foot.
Etymology: med.L acephalus f. Gk akephalos headless (as A-(1), kephale head)
Useful english dictionary. 2012.