noun Biochemistry.
an amino acid, H 2 N(CH 2 ) 3 CH(NH 2 )COOH, obtained by the hydrolysis of arginine and occurring as an intermediate compound in the urea cycle of mammals.

1880–85; ornith(uric acid), secreted by birds + -ine2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To ornithine
World English Dictionary
ornithine (ˈɔːnɪˌθiːn)
an amino acid produced from arginine by hydrolysis: involved in the formation of urea in the liver; diaminopentanoic acid. Formula: NH2(CH2)3CHNH2COOH
[C19: from ornithuric (acid) secreted in the urine of birds, from ornitho- + uric]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Medical Dictionary

ornithine or·ni·thine (ôr'nə-thēn')

Abbr. Orn An amino acid formed by the hydrolysis of arginine and important in the formation of urea.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
ornithine   (ôr'nə-thēn')  Pronunciation Key 
An amino acid not found in proteins, formed by hydrolyzing arginine and important in the formation of urea. Chemical formula: C5H12N2O2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature