velum
/ˈviːləm/noun
(pl. vela /-lə/)
1- chiefly Anatomy, Zoology & Botany a membrane or membranous structure, typically covering another structure or partly obscuring an opening, in particular:【主剖, 主动, 主植】罩膜, 面盘, 尤指：
1.1
- Anatomy the soft palate【剖】软腭。
1.2
- Zoology a membrane, typically bordering a cavity, especially in certain molluscs, medusae, and other invertebrates【动】缘膜。
1.3
- Botany the veil of a toadstool【植】菌幕。
词源
mid 18th cent.: from Latin, literally 'sail, curtain, covering, veil'.