Definitions from Wiktionary ( )

▸ noun:  (countable) Any of various marine invertebrates of the phylum Porifera, that have a porous skeleton often of silica.
▸ noun:  (countable) A piece of porous material used for washing (originally made from the invertebrates, now often made of plastic).
▸ noun:  (uncountable) The porous material that synthetic washing sponges are made of.
▸ noun:  (informal) A heavy drinker.
▸ noun:  (countable, uncountable) A type of light cake.
▸ noun:  (countable, uncountable, British) A type of steamed pudding.
▸ noun:  (slang) 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).
▸ noun:  A person who readily absorbs ideas.
▸ noun:  (countable) A form of contraception that is inserted vaginally; a contraceptive sponge.
▸ noun:  Any sponge-like substance.
▸ noun:  (baking) Dough before it is kneaded and formed into loaves, and after it is converted into a light, spongy mass by the agency of the yeast or leaven.
▸ noun:  Iron from the puddling furnace, in a pasty condition.
▸ noun:  Iron ore, in masses, reduced but not melted or worked.
▸ noun:  A mop for cleaning the bore of a cannon after a discharge. It consists of a cylinder of wood, covered with sheepskin with the wool on, or cloth with a heavy looped nap, and having a handle, or staff.
▸ noun:  The extremity, or point, of a horseshoe, corresponding to the heel.
▸ noun:  (slang) A nuclear power plant worker routinely exposed to radiation.
▸ verb:  (intransitive, slang) To take advantage of the kindness of others.
▸ verb:  (transitive, intransitive with on or upon) To get by imposition; to scrounge.
▸ verb:  (transitive) To deprive (somebody) of something by imposition.
▸ verb:  To clean, soak up, or dab with a sponge.
▸ verb:  To suck in, or imbibe, like a sponge.
▸ verb:  To wipe out with a sponge, as letters or writing; to efface; to destroy all trace of.
▸ verb:  (intransitive, baking) To be converted, as dough, into a light, spongy mass by the agency of yeast or leaven.
▸ verb:  (marine biology, of dolphins) To use a piece of wild sponge as a tool when foraging for food.

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