Main Entry:

neu·tri·no

Pronunciation:

\nü-ˈtrē-(ˌ)nō, nyü-\

Function:

noun

Inflected Form(s):

plural neu·tri·nos

Etymology:

Italian, from neutro neutral, neuter, from Latin neutr-, neuter

Date:

1934

: an uncharged elementary particle that is believed to have a very small mass, that has any of three forms, and that interacts only rarely with other particles

— neu·tri·no·less \-ləs\ adjective