ses·sile 
(sĕsīl′, -əl) Biology
(sĕsīl′, -əl) Biology adj.
1. Permanently attached or fixed; not free-moving: sessile marine invertebrates.
2. Stalkless and attached directly at the base: sessile leaves.
[Latin sessilis, low, of sitting, from sessus, past participle of sedēre, to sit; see sed- in the Appendix of Indo-European roots.]
ses·sili·ty (sĕ-sĭlĭ-tē) n.
sessilesessile leaf