Etymology
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sessile (adj.)

1725, "adhering close to the surface," from Latin sessilis "pertaining to sitting, for sitting on," from sessus, past participle of sedere "to sit" (from PIE root *sed- (1) "to sit"). In botany, of leaves, etc., "attached without any apparent projecting support," from 1753. Meaning "sedentary," of certain animals fixed to one spot, is recorded by 1860.

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Definitions of sessile

sessile (adj.)
permanently attached to a substrate; not free to move about;
sessile marine animals and plants
sessile (adj.)
attached directly by the base; not having an intervening stalk;
the shell of a sessile barnacle is attached directly to a substrate
sessile flowers
Synonyms: stalkless
From wordnet.princeton.edu