a combining form meaning “six,” used in the formation of compound words: hexapartite.
Also, especially before a vowel, hex-.

combining form representing Greek héx six

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World English Dictionary
hexa- or (before a vowel) hex-
combining form
six: hexachord; hexameter
[from Greek, from hexsix]
hex- or (before a vowel) hex-
combining form
[from Greek, from hexsix]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hexa- or hex-

  1. Six: hexagram.

  2. Containing six atoms, molecules, or groups: hexose.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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