腦

brain / mind / head / essence

to be a real headache / to find sth a real headache / to beat one's brains

to use one's brains / to think

leader / the one in control / main (part, character etc)

hypothalamus (anatomy)

variant of 一股腦兒|一股脑儿[yi1 gu3 nao3 r5]

thalamus

erhua variant of 一股腦|一股脑[yi1 gu3 nao3]

personal computer / PC

moronic

to use one's brain

desktop computer

oafish; dull-witted

fontanel (gap between the bones of an infant's skull)

rustic / uncouth / unsophisticated

all of it / lock, stock and barrel

lit. like a three-meter high monk, you can't rub his head (idiom) / fig. at a total loss

see 丈二和尚，摸不著頭腦|丈二和尚，摸不着头脑[zhang4 er4 he2 shang5 , mo1 bu5 zhao2 tou2 nao3]

thalamic lesions

epidemic encephalitis B, aka Japanese encephalitis

epidemic encephalitis B (abbr. for 乙型腦炎|乙型脑炎[yi3 xing2 nao3 yan2])