褪黑素 Save Sign in to save words tuìhēisù ㄊㄨㄟˋ ㄏㄟ ㄙㄨˋ melatonin biochemistry Character by character 褪(tuì)take off 黑(hēi)short name for Heilongjiang 黑龙江 hēilóngjiāng 素(sù)raw silk A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0