GALACTOSE Meaning of GALACTOSE in English [ gə'laktəʊz , -s ]■ noun Chemistry a sugar of the hexose class which is a constituent of lactose and many polysaccharides.OriginC19: from Gk gala , galaktos 'milk' + -ose 2 . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004