a sweet mixture, cooked or uncooked, for coating or filling cakes, cookies, and the like; icing.

a dull or lusterless finish, as on metal or glass.

a process of highlighting the hair by bleaching selected strands.

a material used for decorative work, as signs, displays, etc., made from coarse flakes of powdered glass. ?

the frosting on the cake, something added to make a thing better or more desirable. Also

icing on the cake.

noun

covering , glaze , spread , sugar coating , topping