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Adjective: sessile  sesil
  1. Permanently attached to a substrate; not free to move about
    "sessile marine animals and plants"
     
  2. Attached directly by the base; not having an intervening stalk
    "sessile flowers"; "the shell of a sessile barnacle is attached directly to a substrate"
    - stalkless

Antonym: pedunculate, vagile

Encyclopedia: Sessile