Sessile \Ses"sile\, a. [L. sessilis low, dwarf, from sedere, sessum, to sit: cf. F. sessile.]

1. Attached without any sensible projecting support.

2. (Bot.) Resting directly upon the main stem or branch, without a petiole or footstalk; as, a sessile leaf or blossom.

3. (Zo["o]l.) Permanently attached; -- said of the gonophores of certain hydroids which never became detached.

Source: Webster's Revised Unabridged Dictionary (1913)