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