A hair growing on the side of a man's face, or on his upperlip or his chin.

(常用复数)颊须；髯；髭；胡。

A long, bristly hair growing near the mouth of a cat, rat, or other animal.

猫、鼠或其他动物之须。

A thin hair-like crystal (as of sapphire or a metal) of great strength, used esp. to reinforce composite structural material.

须晶( 一种单晶合成物，用以增加塑料强度)。