loufah sponge(n = noun.plant) loofa, loofah, luffa - the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer;
is a kind of fiber, fibre
is a part of dishcloth gourd, luffa, rag gourd, sponge gourd, strainer vine

chuck up the sponge, glass sponge, madeira sponge, sponge, sponge bag, sponge bath, sponge cake, sponge cloth, sponge down, sponge genus, sponge gourd, sponge mop, sponge morel, sponge mushroom, sponge off, sponge on, sponge up, vegetable sponge, victoria sponge