TRIACETATE Meaning of TRIACETATE in English [ trʌɪ'asɪteɪt ](also cellulose ~ ) ■ noun a form of cellulose acetate containing three acetate groups per glucose monomer, used as a basis for man-made fibres. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004