marsh·mal·low 
(märshmĕl′ō, -măl′ō)
(märshmĕl′ō, -măl′ō)n.
1.
a. A light, spongy, very sweet confection made of corn syrup, gelatin, sugar, and often vanilla.
b. A confection of sweetened paste, formerly made from the root of the marshmallow plant.
2. often marsh mallow A perennial plant (Althaea officinalis) in the mallow family, native to Eurasia and naturalized in eastern North America, having pink flowers and a mucilaginous root used in herbal medicine and formerly in confections.
marshmal′low·y adj.