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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Tetrad \Tet"rad\, noun [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.
From WordNet (r) 2.0 [wn]:
tetrad
noun: the cardinal number that is the sum of three and one [syn: {four}, {4}, {IV}, {quatern}, {quaternion}, {quaternary}, {quaternity}, {quartet}, {quadruplet}, {foursome}, {Little Joe}]
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Definitions retrieved from local copies of the freely distributed DICT client/server software and databases. Click here for database copyright information. - KM |