SEI WHALE Meaning of SEI WHALE in English [ seɪ ]■ noun a small rorqual with dark steely-grey skin and white grooves on the belly. [ Balaenoptera borealis .]Originearly 20th cent.: from Norw. sejhval . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004