(1):

(a.) Headless.

(2):

(a.) Deficient and the beginning, as a line of poetry.

(3):

(a.) Without a leader or chief.

(4):

(a.) Having the style spring from the base, instead of from the apex, as is the case in certain ovaries.

(5):

(a.) Without a distinct head; - a term applied to bivalve mollusks.

(6):

(a.) Wanting the beginning.