monad
(noun)
noun
1. (chemistry) an atom having a valence of one
Definition categories: substance, atom
2. a singular metaphysical entity from which material properties are said to derive
Similar word(s): monas
Definition categories: quantity, ace, one, single, unity
3. (biology) a single-celled microorganism (especially a flagellate protozoan)
Definition categories: animal, microorganism