sessile

Definitions of sessile

1. adjective

   attached directly by the base; not having an intervening stalk
   “sessile flowers”

   “the shell of a sessile barnacle is attached directly to a substrate”

   synonyms: stalkless

   antonyms:

   pedunculate

   having or growing on or from a peduncle or stalk
2. adjective

   permanently attached to a substrate; not free to move about
   “sessile marine animals and plants”

   antonyms:

   vagile

   having freedom to move about

   free-swimming, unattached

   (of animals) able to swim about; not attached