基音

基音	jī yīn	fundamental tone
基	jī	(bound form) base; foundation / (bound form) radical (chemistry) / (bound form) gay (loanword from English into Cantonese, Jyutping: gei1, followed by orthographic borrowing from Cantonese)
音	yīn	sound / noise / note (of musical scale) / tone / news / syllable / reading (phonetic value of a character)