Meaning of bath sponge

bath' sponge"

Pronunciation: [key]
  1. any of various common sponges, of the family Spongiidae, that have a skeletal network composed of fibers of spongin: collected in the Gulf of Mexico, the Mediterranean, and the Caribbean for their commercial value.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.