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Blech. These are the grossest words.

lambda particle

or lambda baryon

noun, Physics.
any of a family of neutral baryons with strangeness −1 or charm +1, and isotopic spin 0. The least massive member of the lambda family was the first strange particle to be discovered. Symbol: Λ.
Origin of lambda particle
1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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lambda particle in Science
lambda particle  
An electrically neutral baryon having a mass 2,183 times that of the electron and a mean lifetime of approximately 2.6 × 10-10 seconds. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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