Hex"ad (?), n. [L. hexas, hexadis, the number six, Gr. , , fr. 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.


© Webster 1913.

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