a combining form meaning “cycle,” used in the formation of compound words: cyclohexane.
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 Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for cyclo-


before a vowel cycl-

combining form

indicating a circle or ringcyclotron
denoting a cyclic compoundcyclohexane

Word Origin for cyclo-

from Greek kuklos cycle
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

Medicine definitions for cyclo-



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.