The Devil's Dictionary
The ultimate, indivisible unit of matter. (See Molecule.) According to Leibnitz, as nearly as he seems willing to be understood, the monad has body without bulk, and mind without manifestation — Leibnitz knows him by the innate power of considering. He has founded upon him a theory of the universe, which the creature bears without resentment, for the monad is a gentleman. Small as he is, the monad contains all the powers and possibilities needful to his evolution into a German philosopher of the first class — altogether a very capable little fellow. He is not to be confounded with the microbe, or bacillus; by its inability to discern him, a good microscope shows him to be of an entirely distinct species.