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oct-

1.
variant of octa- or octo- before a vowel:
octal.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for oct-

oct-

combining form
1.
(used before a vowel) a variant of octo-

octo-

combining form
1.
eight: octosyllabic, octagon
Word Origin
from Latin octo, Greek okto
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
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