The Collaborative International Dictionary of English v.0.48:
Monas \Mo"nas\, n. [NL. See Monad.] (Zool.) A genus of minute flagellate Infusoria of which there are many species, both free and attached. See Illust. under Monad. [1913 Webster]WordNet (r) 3.0 (2006):
monas n 1: a singular metaphysical entity from which material properties are said to derive [syn: monad, monas]