FOOLSCAP Meaning of FOOLSCAP in English [ 'fu:lzkap , 'fu:ls- ]■ noun Brit. a size of paper, about 330 × 200 (or 400) mm.OriginC17: said to be named from a former watermark representing a fool's cap. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004