ve·lum
noun/ˈviːləm/
/ˈviːləm/
(plural vela
(anatomy)/ˈviːlə/
/ˈviːlə/
)- a layer of tissue that covers something, especially the soft palate inside the mouth
罩膜；缘膜 Word Originmid 18th cent.: from Latin, literally ‘sail, curtain, covering, veil’.