a combining form meaning “cycle,” used in the formation of compound words: cyclohexane.
Also, especially before a vowel, cycl-.

< Greek kyklo-, combining form of kýklos circle, ring; cognate with Sanskrit cakra, wheel Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cyclo- or (before a vowel) cycl-
combining form
1.  indicating a circle or ring: cyclotron
2.  denoting a cyclic compound: cyclohexane
[from Greek kukloscycle]
cycl- or (before a vowel) cycl-
combining form
[from Greek kukloscycle]

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

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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