SPONGE n.
rass sponge, any one of several varieties of coarse commercial sponges 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 Platinu…