monad

monad is a Noun

Definition:

[1] An ultimate atom, or simple, unextended point; something ultimate and indivisible.

[2] 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] One of the smallest flangellate Infusoria; esp., the species of the genus Monas, and allied genera.

[4] A simple, minute organism; a primary cell, germ, or plastid.

[5] An atom or radical whose valence is one, or which can combine with, be replaced by, or exchanged for, one atom of hydrogen. Monad deme (Biol.), in tectology, a unit of the first order of individuality.