An electrically neutral baryon containing a bottom quark and having a mass about 11,000 times that of the electron and a mean lifetime of about 1.2 × 10-12 second. Also called bottom lambda 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.