lambda particle

or lambda baryon

noun

, Physics.

1. 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. : Λ

lambda particle

1. 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.
2. See Table at subatomic particle

Word History and Origins

Origin of lambda particle¹

First recorded in 1950–55