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a. A discrete, small unit, such as a subatomic particle: baryon.
b. A property of a physical system when quantized as a particle: phonon.
2. A sequence of nucleotides or region of DNA: codon.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.