GNU Collaborative International Dictionary of English

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1.       
   Monad , n. [L. monas, -adis, a unit, Gr. , , fr. μόνος alone.]
   An ultimate atom, or simple, unextended point; something ultimate and indivisible.
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   (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.
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   (Zool.) One of the smallest flagellate Infusoria; esp., the species of the genus Monas, and allied genera.
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   (Biol.) A simple, minute organism; a primary cell, germ, or plastid.
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   (Chem.) An atom or radical whose valence is one, or which can combine with, be replaced by, or exchanged for, one atom of hydrogen.
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   Monad deme (Biol.), in tectology, a unit of the first order of individuality.
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