acetic (adj.)youdaoicibaDictgodict[acetic 词源字典]
1808, from French acétique "pertaining to vinegar," from Latin acetum "vinegar" (properly vinum acetum "wine turned sour;" see vinegar), originally past participle of acere "be sour," related to acer "sharp" (see acrid).[acetic etymology, acetic origin, 英语词源]