octo-

Collins
World English Dictionary
octo-, (before a vowel) octa- or (before a vowel) oct-
 
combining form
eight: octosyllabic; octagon
 
[from Latin octo, Greek okto]
 
octa-, (before a vowel) octa- or (before a vowel) oct-
 
combining form
 
[from Latin octo, Greek okto]
 
oct-, (before a vowel) octa- or (before a vowel) oct-
 
combining form
 
[from Latin octo, Greek okto]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

octo-
see octa-.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

octo- or oct- or octa-
pref.
Eight: octan.

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