MONAD

n. single-celled organism (Biology); flagellated protozoan (Biology); atom or radical with the value of one (Chemistry); inseparable metaphysical entity (Philosophy)

Monad may refer to:Monad, a term used by the ancient philosopher Epicurus to describe the smallest units of matter, much like Democritus's notion of an atom.Monad (symbol), a term used by ancient philosophers Pythagoras, Parmenides, Xenophanes, Plato, Aristotle, and Plotinus as a term for God or the first being, or the totality of all beings.Monad (Gnosticism), the most primal aspect of God in Gnosticism.the concept of "one essence" in the metaphysical and theological theory of Monism.Monadology, a book of philosophy by Gottfried Leibniz in which monads are a basic unit of perceptual realityPhysical Monadology by Immanuel Kant also dealt with this topic.In Hermetica, (a category of popular Late Antique literature purporting to contain secret wisdom) The Cup or Monad is one of the texts making up the Corpus Hermetica.In early biology, the indivisible life essence, either the cell or nucleus.
See more at Wikipedia.org...

Noun
1. an atom having a valence of one
(hypernym) atom
2. a singular metaphysical entity from which material properties are said to derive
(synonym) monas
(hypernym) one, 1, I, ace, single, unity

n. monad

(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.
  

(n.)
One of the smallest flangellate Infusoria; esp., the species of the genus Monas, and allied genera.
  

(n.)
An ultimate atom, or simple, unextended point; something ultimate and indivisible.
  

(n.)
An atom or radical whose valence is one, or which can combine with, be replaced by, or exchanged for, one atom of hydrogen.
  

(n.)
A simple, minute organism; a primary cell, germ, or plastid.