|a.||1.||Attached without any sensible projecting support.|
|2.||(Bot.) Resting directly upon the main stem or branch, without a petiole or footstalk; |
|3.||(Zool.) Permanently attached; - said of the gonophores of certain hydroids which never became detached.|
|Adj.||1.||sessile - permanently attached to a substrate; not free to move about; "an attached oyster"; "sessile marine animals and plants"|
vagile - having freedom to move about; "vagile aquatic animals"
|2.||sessile - attached directly by the base; not having an intervening stalk; "sessile flowers"; "the shell of a sessile barnacle is attached directly to a substrate"|