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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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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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