鼯も鼠みもみMeanings1nounflying squirrelarchaicArchaic term for flying squirrel. In modern Japanese, ムササビ or モモンガ are used instead. This word may appear in classical literature or historical contexts.古ふるい文ぶん献けんには「鼯も鼠み」という表ひょう記きでムササビを指さすことがある。In old documents, the notation 鼯鼠 sometimes refers to the flying squirrel.