The American Heritage® Dictionary of the English Language, 4th Edition
n. A nonessential amino acid, C5H10N2O3, occurring widely in plant and animal tissue and proteins and produced commercially for use in medicine and biochemical research.
n. A nonessential amino acid C5H10N2O3 found in most animal and plant proteins.
The Century Dictionary and Cyclopedia
n. A colorless crvstalline compound, H2N.CO. CH(NH2).CH2.CH2COOH, found, together with asparagin, widely distributed in the vegetable kingdom. It is deposited in slender needles. Also called A-glutamamide and, incorrectly, glutamin.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a crystalline amino acid occurring in proteins; important in protein metabolism
Word Usage
"An enzyme called glutamine synthetase is a key actor in a biological cycle that regulates the balance."