from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An amino acid, C6H14N4O2, obtained from the hydrolysis or digestion of plant and animal protein.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An amino acid found in animal foods that plays an important role in several physiological processes.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a bitter tasting amino acid found in proteins and necessary for nutrition; its absence from the diet leads to a reduced production of spermatozoa
German Arginin, possibly from Greek arginoeis, bright; see arg- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From German Arginin, perhaps from Ancient Greek ἀργινόεις (arginoeis, "brightly-shining, white"). (Wiktionary)