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Webster 1913 Edition

Adj.

(Chem.)

Of or pertaining to a tetrad; possessing or having the characteristics of a tetrad;

as, a carbon is a

tetradic

element

tetradic ‎(not comparable)

Of or relating to a tetrad.
(of a shape) Having four-fold symmetry; used especially of the digits 0, 1 and 8.