'Monad' definitions:

Definition of 'monad'

From: WordNet
noun
(chemistry) an atom having a valence of one
noun
A singular metaphysical entity from which material properties are said to derive [syn: monad, monas]
noun
(biology) a single-celled microorganism (especially a flagellate protozoan)

Definition of 'Monad'

From: GCIDE
  • Monad \Mon"ad\, n. [L. monas, -adis, a unit, Gr. ?, ?, fr. mo`nos alone.]
  • 1. An ultimate atom, or simple, unextended point; something ultimate and indivisible. [1913 Webster]
  • 2. (Philos. of Leibnitz) 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. [1913 Webster]
  • 3. (Zool.) One of the smallest flagellate Infusoria; esp., the species of the genus Monas, and allied genera. [1913 Webster]
  • 4. (Biol.) A simple, minute organism; a primary cell, germ, or plastid. [1913 Webster]
  • 5. (Chem.) An atom or radical whose valence is one, or which can combine with, be replaced by, or exchanged for, one atom of hydrogen. [1913 Webster]
  • Monad deme (Biol.), in tectology, a unit of the first order of individuality. [1913 Webster]

Synonyms of 'monad'

From: Moby Thesaurus