From The Collaborative International Dictionary of English v.0.48 [gcide]:
Hexad \Hex"ad\, n. [L. hexas, hexadis, the number six, Gr. ?, ?,
fr. "e`x 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.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
hexad
n 1: the cardinal number that is the sum of five and one [syn:
{six}, {6}, {VI}, {sixer}, {sise}, {Captain Hicks}, {half a
dozen}, {sextet}, {sestet}, {sextuplet}, {hexad}]
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