| 释义 | 
		thre·o·nine \ˈthrēəˌnēn, -_nə̇n\ noun (-s) Etymology: probably from threon- (as in threonic acid) + -ine  : a crystalline alpha-amino acid CH3CHOHCH(NH2)COOH known in six optically isomeric forms; 2-amino-3-hydroxy-butyric acid; especially  : the levorotatory l-form related to d-threose that is obtained by hydrolysis of various proteins (as casein and egg proteins) and is essential to normal nutrition |