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Definitions for: Tetrad
[n] the cardinal number that is the sum of three and one
Webster (1913) Definition: Tet"rad, n. [L. tetras, -adis, Gr. ?, ?: cf. F.
t['e]trade.]
1. The number four; a collection of four things; a
quaternion.
2. (Chem.) A tetravalent or quadrivalent atom or radical; as,
carbon is a tetrad.
Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity
See Also: digit, figure
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