1. A univalent element or radical. 2. A unicellular organism. 3. In meiosis, the single chromosome derived from a tetrad after the first and second maturation divisions. [G. monas, the number one, unity]
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mo·nad 'mō-.nad n
1) a flagellated protozoan (as of the genus Monas)
2) a monovalent element or radical
3) any of the four chromatids that make up a tetrad in meiosis
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mon·ad (monґəd) [Gr. monas a unit, from monos single] 1. a single-celled protozoon or a single-celled coccus. 2. a univalent radical or element. 3. in meiosis, one member of a tetrad.Medical dictionary. 2011.