a. 无柄的, 固着的

[医] 无柄的, 无蒂的; 固着的

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.