名詞 bruxism:

1. involuntarily or unconsciously clenching or grinding the teeth, typically during sleep

brux.ism

n.（名詞）
The habitual, involuntary grinding or clenching of the teeth, usually during sleep, as from anger, tension, fear, or frustration.
磨牙：因憤怒、緊張、恐懼或失望，而通常在睡夢(mèng)中的習(xí)慣性且無(wú)意識(shí)地磨牙或咬牙

來(lái)源：
From New Latin brôxis [a gnashing]
源自 現(xiàn)代拉丁語(yǔ) brôxis [磨牙]
from Greek brôkein [to gnash]
源自 希臘語(yǔ) brôkein [磨牙]