sessile
Permanently attached to a substrate; not free to move about.
Example
“a sessile oyster”
Other meanings
Attached directly by the base; not having an intervening stalk; stalkless.
Word history
From Latin "sessilis" (sitting).
Where this comes from
This definition is adapted from “sessile” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.