lambda-b baryon

[ lam-duh-bee-bar-ee-on ]
/ ˈlæm dəˈbi ˈbær iˌɒn /

noun Physics.

a protonlike baryon containing a b quark; a neutral baryon with a mass 11,000 times that of the electron and a mean lifetime of approximately 1.1 X 10-12 seconds.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020