Sessile (Biology Glossary)

Sessile : 1.  Generally, lacking motility or means of self-locomotion; immobile or incapable of movement. Sessile organisms may move via external forces such as wind or water currents but are more often permanently fixed to a solid object such as a rock, soil, or another organism.2.  In botany, the property of a plant or plant part that is attached directly by its base to an object or another plant part, i.e. without an intervening stem, stalk, or petiole.