sessile
/ˈsesaɪl/adjective
1- Biology (of an organism, e.g. a barnacle) fixed in one place; immobile【生】（生物体, 如藤壶）固着的; 固定的。
1.1
- Botany & Zoology (of a plant or animal structure) attached directly by its base without a stalk or peduncle【植, 动】（植物或动物结构）无柄的：
sporangia may be stalked or sessile.
芽孢囊可能有柄, 也可能无柄。
词源
early 18th cent.: from Latin sessilis, from sess- 'seated', from the verb sedere.