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Definition of tetrad : 1. A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.
2. The number four; a collection of four things; a quaternion.

Synonyms:

intravenous feeding, quatern, 4, quaternary, quaternity, four-spot, quad, Little Joe, quartet, quaternion, IV, four, quadruplet, quadruple, quartette, foursome