Tet″rad (?), n. [L. tetras, -adis, Gr. �, �: cf. F. tétrade.] 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.