Webster's Revised Unabridged Dictionary · 1913

Acephalous

Acephalous ({not transcribed}) , adjective

[See Acephal.]

1.
Headless.
2.
(Zoology) Without a distinct head; -- a term applied to bivalve mollusks.
3.
(Botany) Having the style spring from the base, instead of from the apex, as is the case in certain ovaries.
4.
Without a leader or chief.
5.
Wanting the beginning.
A false or acephalous structure of sentence. — De Quincey
6.
(Prosody) Deficient at the beginning, as a line of poetry. — Brande