Tetrad \Tet"rad\, n. [L. tetras, -adis, Gr. ?, ?: cf. F.
t['e]trade.]
1. The number four; a collection of four things; a
quaternion.
[1913 Webster]
2. (Chem.) A tetravalent or quadrivalent atom or radical; as,
carbon is a tetrad.
[1913 Webster] Tetradactyl
The Collaborative International Dictionary of English v.0.48
tetrad
n : the cardinal number that is the sum of three and one [syn: four,
4, IV, quatern, quaternion, quaternary, quaternity,
quartet, quadruplet, foursome, Little Joe]
WordNet (r) 2.0
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