1. (a.) Headless.

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

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

4. (a.) Without a leader or chief.

5. (a.) Wanting the beginning.

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