GATEAU Meaning of GATEAU in English [ 'gatəʊ ]■ noun ( plural ~s or ~x -əʊz ) chiefly Brit. a rich cake, typically one containing layers of cream or fruit.OriginC19: from Fr. gâteau 'cake'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004