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1. (n.) tetrad
a group of four.
2. tetrad
the number four.
3. tetrad
Biol. a group of four chromatids formed by synapsis at the beginning of meiosis.
Etymology: (1645–55; < Gk tetrad-, s. of tetrás group of four)
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| Definition of 'tetrad' |
Princeton's WordNet |
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1. (noun) four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
the cardinal number that is the sum of three and one
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| Definition of 'tetrad' |
Webster Dictionary |
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1. (noun) tetrad
the number four; a collection of four things; a quaternion
2. (noun) tetrad
a tetravalent or quadrivalent atom or radical; as, carbon is a tetrad
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Definitions of tetrad 
