hexad Meaning, Definition & Usage

  1. noun the cardinal number that is the sum of five and one
    sixer; sestet; Captain Hicks; sise; VI; six; sextet; half a dozen; 6; sextuplet.

WordNet

Hex"ad noun
Etymology
L. hexas, hexadis, the number six, Gr. , , fr. six.
Definitions
  1. (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