1. A singular metaphysical entity from which material properties are said to derive
   "Some philosophers consider the monad to be the fundamental unit of reality";
   - monas
    
2. (biology) a single-celled microorganism (especially a flagellate protozoan)
   "The pond water was teeming with various monads"
    
3. (chemistry) an atom having a valence of one
   "Hydrogen is an example of a monad in chemistry"

Derived forms: monades, monads

Type of: 1, atom, I, microorganism, one, unity

Encyclopedia: Monad