[ hek-sad ]
/ ˈhɛk sæd /


the number six.
a group or series of six.

Origin of hexad

1650–60; < Late Latin hexad- (stem of hexas) < Greek hexad- (stem of hexás) unit of six, equivalent to héx six + -ad- -ad1
Related formshex·ad·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hexad

British Dictionary definitions for hexad


/ (ˈhɛksæd) /


a group or series of six
the number or sum of six
Derived Formshexadic, adjective

Word Origin for hexad

C17: from Greek hexas, from hex six
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for hexad


[ hĕksăd′ ]


A group or series of six.
An element or radical having a valence of six.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.