a. [ L. sessilis low, dwarf, from sedere, sessum, to sit: cf. F. sessile. ] 1. Attached without any sensible projecting support. [ 1913 Webster ]
2. (Bot.) Resting directly upon the main stem or branch, without a petiole or footstalk; as, a sessile leaf or blossom. [ 1913 Webster ]
3. (Zool.) Permanently attached; -- said of the gonophores of certain hydroids which never became detached. [ 1913 Webster ]
a. (Zool.) Having eyes which are not elevated on a stalk; -- opposed to stalk-eyed. [ 1913 Webster ]
Sessile-eyed Crustacea, the Arthrostraca. [ 1913 Webster ]