脑回

脑回	nǎo huí	gyrus (neuroanatomy)
脑	nǎo	brain / mind / head / essence
回	Huí	Hui ethnic group (Chinese Muslims)
回	huí	to go back; to return; to turn back; to turn around / to reply; to answer / classifier for literary divisions (acts of a play, sections or chapters of a classic book) / classifier for occurrences or times
回	huí	to curve / to return / to revolve
回	huí	variant of 回