GRIMALKIN Meaning of GRIMALKIN in English [ grɪ'malkɪn , -'mɔ:l- ]■ noun archaic1》 a cat. 2》 a spiteful old woman.OriginC16: from grey + Malkin (familiar form of the given name Matilda ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004