octo-

octo-

or octa- or oct-

pref.

Eight: octane.

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[Greek okta-, oktō- (from oktō) and Latin octō- (from octō); see oktō(u) in Indo-European roots.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

octo-

,

octa-

or before a vowel

oct-

combining form

eight: octosyllabic; octagon.

[from Latin octo, Greek okto]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

octo-

var. of octa-: octopod.

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.