marshmallow (n.)youdaoicibaDictYouDict[marshmallow 词源字典]
Old English mersc-mealwe "kind of mallow plant (Althea officinalis) which grows near salt marshes;" from marsh + mallow. The confection (so called from 1877) originally was made from paste from the roots of this plant. The Greek word for the plant, althaea, is from althein "to heal."[marshmallow etymology, marshmallow origin, 英语词源]