Adjective
Attached without any sensible projecting support.
Resting directly upon the main stem or branch, without a petiole or footstalk; as, a sessile leaf or blossom.
Permanently attached; -- said of the gonophores of certain hydroids which never became detached.
Source: Webster's dictionarysessile flowers Source: Internet
the shell of a sessile barnacle is attached directly to a substrate Source: Internet
sessile marine animals and plants Source: Internet
All sponges are sessile aquatic animals. Source: Internet
A terrestrial Geonemertes sp. on a rotting log, from Mindanao Island, the Philippines Most nemerteans are marine animals that burrow in sediments, lurk in crevices between shells, stones or the holdfasts of algae or sessile animals. Source: Internet
Animal tissues Stylized cutaway diagram of an animal cell (with flagella) The kingdom Animalia or metazoa, contains multicellular organisms that are heterotrophic and motile (although some have secondarily adopted a sessile lifestyle). Source: Internet