Adjective sessile has 2 senses
  1. sessile, attached - permanently attached to a substrate; not free to move about; "an attached oyster"; "sessile marine animals and plants"
    Antonyms: vagile, free-swimming, unattached
  2. sessile, stalkless - attached directly by the base; not having an intervening stalk; "sessile flowers"; "the shell of a sessile barnacle is attached directly to a substrate"
    Antonyms: pedunculate, stalked
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