sponge -
a porous mass of interlacing fibers that forms the internal skeleton of various marine animals and usable to absorb water or any porous rubber or cellulose product similarly used
sponge -
A person who takes advantage of the generosity of others abstractly imagined to absorb or soak up the money or efforts of others like a sponge.
sponge -
To be converted, as dough, into a light, spongy mass by the agency of yeast or leaven.
Wikipedia
Sponges are animals of the phylum Porifera (Pore bearer). Their bodies consist of jelly-like mesohyl sandwiched between two thin layers of cells. While all animals have unspecialized cells that can transform into specialized cells, sponges are unique in having some specialized cells that can transform into other types, often migrating between the main cell layers and the mesohyl in the process.
OmegaWiki Dictionary
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sponge An member of any of the species belonging to the phylum Porifera. They are marine porous animals.
sponge A piece of porous material used for washing.