a combining form meaning “time,” used in the formation of compound words: chronometer.
Also, especially before a vowel, chron-.

< Greek, combining form of chrónos Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chrono- or (before a vowel) chron-
combining form
indicating time: chronology; chronometer
[from Greek khronos time]
chron- or (before a vowel) chron-
combining form
[from Greek khronos time]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

comb. form meaning "time," from Gk. khrono-, from khronos "time."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

chrono- or chron-
Time: chronobiology.

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