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Webster 1913 Edition
Hexad
Hex′ad
,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
. Also used as an adjective. hexad
in sulphuric acid