Any of a group of three unstable baryons containing a charm quark and having a positive, neutral, or negative electric charge and a mass of 4,474 times that of an electron and a mean lifetime of about 2 × 10-15 second. Also called charmed sigma baryon.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.