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Definition of Sessile
1. Adjective. Permanently attached to a substrate; not free to move about. "Sessile marine animals and plants"
2. Adjective. Attached directly by the base; not having an intervening stalk. "The shell of a sessile barnacle is attached directly to a substrate"
Definition of Sessile
1. a. Attached without any sensible projecting support.
Definition of Sessile
1. permanently attached [adj]
Medical Definition of Sessile
1. Attached by a base rather than a stalk, a sessile lesion adheres closely to the surface (mucosa). (27 Sep 1997)