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hexad

[hek-sad]
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noun
  1. the number six.
  2. a group or series of six.
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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. 2018

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British Dictionary definitions for hexad

hexad

noun
  1. a group or series of six
  2. the number or sum of six
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Derived Formshexadic, adjective

Word Origin

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

hexad in Medicine

hexad

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