Sponge (noun)

1. An aquatic invertebrate of the phylum Porifera, typically having a horny, siliceous or calcareous skeleton and a porous body that is supported by a fibrous network of cells and often lives attached to a rock or other surface.
2. A piece of natural or synthetic porous material that is used for cleaning surfaces, wiping liquids, or applying cosmetics.
3. A person who lives off others or who is dependent on them.

Origin:

Middle english, from old english spongia, from latin spongia, from greek spongia.

Examples:

1. The ancient Greeks and Romans used sponges for cleaning and bathing.
2. He squeezed the water out of the sponge.
3. The company is a sponge on the resources of the state.
4. The sponge cake was light and fluffy.
5. A sponge absorbs water easily.