from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An amino acid, C5H12N2O2, not found in proteins, formed by hydrolyzing arginine and important in the formation of urea.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An amino acid, 2,5-diaminopentanoic acid, that is not present in protein, but is an intermediate in the biosynthesis of urea.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an amino acid that does not occur in proteins but is important in the formation of urea
ornith(uric acid), an acid found in birds' urine (ornith(o)- + uric acid) + -ine2.(American Heritage® Dictionary of the English Language, Fourth Edition)