뇌

Noun

 * 1) brain

Noun

 * 1)  mental suffering

Etymology 3
Korean reading of various Chinese characters.

Etymology 4
South Korean reading of various Chinese characters, originally.

Usage notes
In South Korea, the original Sino-Korean reading is used if the hanja is not part of the first syllable of a Sino-Korean compound word. The change in reading from to  is known as.