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[kree-at-n-een, -in] /kriˈæt nˌin, -ɪn/
noun, Biochemistry
a crystalline end product of creatine metabolism, C 4 H 7 N 3 O, occurring in urine, muscle, and blood.
Origin of creatinine
1850-55; < German Kreatinin, equivalent to kreatin creatine + -in -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for creatinine
  • For example, liver and kidney transplant patients are monitored using a blood test for an enzyme called creatinine.
  • creatinine is a breakdown product of creatine, which is an important part of muscle.
  • High levels of creatinine may indicate kidney damage.
  • The test measures the amount of albumin and creatinine in your urine.
  • The result is reported as the ratio of albumin to creatinine.
  • High levels suggest kidney damage, although kidney problems can also be present with normal creatinine levels.
British Dictionary definitions for creatinine


an anhydride of creatine that is abundant in muscle and excreted in the urine
Word Origin
C19: from German Kreatinin, from Kreatincreatine + -in-ine²
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 creatinine

by 1847, from creatine + chemical suffix -ine (2).

Online Etymology Dictionary, © 2010 Douglas Harper
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creatinine in Medicine

creatinine cre·at·i·nine (krē-āt'n-ēn', -ĭn)
A creatine anhydride formed by the metabolism of creatine and found in muscle tissue and blood and normally excreted in the urine as metabolic waste.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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creatinine in Science
  (krē-āt'n-ēn', -ĭn)   
A compound formed by the metabolism of creatine, found in muscle tissue and blood and normally excreted in the urine as a metabolic waste. Measurement of creatinine levels in the blood is used to evaluate kidney function. Chemical formula: C4H7N3O.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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