SPONGE n.
ponges having the surface irregularly tufted, as Spongia graminea, and S. equina, variety cerebriformis, of Florida and the West Indies. -- Horse sponge, a coarse commercial sponge, especially Spongia equina. -- Platinum sponge. (Chem.) See under Platinum. -- Pyrotechnical sponge, a substance made of mushrooms or fu…