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a combining form meaning “cycle,” used in the formation of compound words:
Also, especially before a vowel, cycl-.
Origin of cyclo-
< Greek kyklo-, combining form of kýklos circle, ring; cognate with Sanskrit cakra, wheel Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for cyclo-


combining form
indicating a circle or ring: cyclotron
denoting a cyclic compound: cyclohexane
Word Origin
from Greek kukloscycle
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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Word Origin and History for cyclo-

before a vowel, cycl-, word-forming element meaning "circle, ring, rotation," from Latinized form of Greek kyklo-, comb. form of kyklos "circle, wheel, ring" (see cycle (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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cyclo- in Medicine

cyclo- or cycl-
Circle; cycle: cyclophoria. A cyclic compound: cyclopeptide.

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