creatinine

[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.

Origin:
1850–55; < German Kreatinin, equivalent to kreatin creatine + -in -ine2

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World English Dictionary
creatinine (kriːˈætəˌniːn)
 
n
an anhydride of creatine that is abundant in muscle and excreted in the urine
 
[C19: from German Kreatinin, from Kreatincreatine + -in-ine²]

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Etymonline
Word Origin & History

creatinine
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)
n.
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
  muscle.
High levels of creatinine may indicate kidney damage.
The test measures the amount of albumin and creatinine in your urine.
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