n. [ L. monas, -adis, a unit, Gr. &unr_;, &unr_;, 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 ]

‖n. pl. [ NL. See Monad. ] (Zool.) The Infusoria. [ 1913 Webster ]

‖n. pl. [ NL., from Gr. mo`nos alone + 'adelfo`s brother. ] (Bot.) A Linnaean class of plants having the stamens united into a tube, or ring, by the filaments, as in the Mallow family. [ 1913 Webster ]

{ } a. [ Cf. F. monadelphie. ] (Bot.) Of or pertaining to the Monadelphia; having the stamens united in one body by the filaments. [ 1913 Webster ]

{ } a. Of, pertaining to, or like, a monad, in any of its senses. See Monad, n. Dr. H. More. [ 1913 Webster ]

a. [ Monad + -form. ] (Biol.) Having the form of a monad; resembling a monad in having one or more filaments of vibratile protoplasm; as, monadiform young. [ 1913 Webster ]

n. [ Monad + -logy. ] (Philos.) The doctrine or theory of monads. [ 1913 Webster ]