| Monad 1. (n.) An ultimate atom, or simple, unextended point; something ultimate and indivisible. 2. (n.) The elementary and indestructible units which were conceived of as endowed with the power to produce all the changes they undergo, and thus determine all physical and spiritual phenomena. 3. (n.) One of the smallest flangellate Infusoria; esp., the species of the genus Monas, and allied genera. 4. (n.) A simple, minute organism; a primary cell, germ, or plastid. 5. (n.) An atom or radical whose valence is one, or which can combine with, be replaced by, or exchanged for, one atom of hydrogen. Thesaurus Entries I, ace, air, an existence, atom, atomic particles, being, body, brute matter, building block, chemical element, component, constituent, creature, critter, earth, electron, element, elementary particle, elementary unit, entelechy, entity, fire, fundamental particle, hyle, hypostasis, individual, ion, life, material, material world, materiality, matter, meson, molecule, natural world, nature, no other, none else, nothing else, nought beside, nuclear particle, object, one, one and only, organism, person, persona, personality, physical world, plenum, proton, quark, something, soul, stuff, substance, substratum, the four elements, thing, unit, unit of being, water |