WordReference Random House Unabridged Dictionary of American English © 2026
hex•ad  (hek′sad),USA pronunciation n. 
  1. Mathematicsthe number six.
  2. Mathematicsa group or series of six.
  • Greek hexad- (stem of hexás) unit of six, equivalent. to héx six + -ad- -ad1
  • Late Latin hexad- (stem of hexas)
  • 1650–60
hex•ad′ic, adj. 

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