Tetrad

[tetræd]

Definition

(n.) The number four; a collection of four things; a quaternion.

(n.) A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.

Inputed by Armand

Definition

n. a group of four: (chem.) an atom radical or element having a combining power of four.—adjs. Tet′rad Tetrad′ic.—n. Tet′radite one who attaches mystic properties to the number four one born in the fourth month or on the fourth day of the month.

Inputed by Inez