Tetrad
Tet"rad
(?), n. [L. tetras, -adis, Gr. , : cf. F. ttrade.] 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]
{
Tet`ra*dac"tyl
,Tet`ra*dac"tyle
} (?), a. [Cf. F. ttradactyle.] (Zol.) Tetradactylous.[1913 Webster]
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Mon 01st March 2021