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Webster 1913 Edition

Noun.

[L.

hexas

hexadis

, the number six, Gr. [GREEK], [GREEK], fr.

ἕξ

six.]

(chem.)

An atom whose valence is six, and which can be theoretically combined with, substituted for, or replaced by, six monad atoms or radicals;

as, sulphur is a

hexad

in sulphuric acid

. Also used as an adjective.