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Adjective: sessile  'se,sI(-u)l or se-sil
  1. (biology) permanently attached to a substrate; not free to move about
    "sessile marine animals and plants"
     
  2. (biology) attached directly by the base; not having an intervening stalk
    "the shell of a sessile barnacle is attached directly to a substrate"; "sessile flowers";
    - stalkless

Antonym: pedunculate, vagile

Encyclopedia: Sessile