[kree-at-n-een, -in]
noun Biochemistry.
a crystalline end product of creatine metabolism, C 4 H 7 N 3 O, occurring in urine, muscle, and blood.

1850–55; < German Kreatinin, equivalent to kreatin creatine + -in -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
creatinine (kriːˈætəˌniːn)
an anhydride of creatine that is abundant in muscle and excreted in the urine
[C19: from German Kreatinin, from Kreatincreatine + -in-ine²]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

by 1847, from creatine + -ine.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
creatinine   (krē-āt'n-ēn', -ĭn)  Pronunciation Key 
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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Example sentences
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
High levels of creatinine may indicate kidney damage.
The test measures the amount of albumin and creatinine in your urine.
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