NATATORIUM Meaning of NATATORIUM in English [ ˌneɪtə'tɔ:rɪəm ]■ noun N. Amer. a swimming pool.OriginC19: from late L., neut. (used asnoun) of natatorius 'relating to a swimmer', from natare 'to swim'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004