Beta

·add. ·noun The second letter of the Greek alphabet, B, /. ·see B, and ·cf. etymology of Alphabet.

beta
bēta, ae (bētis, is, Ser. Samm. 54, 9), f. [hence Fr. bette; Engl. beet], a vegetable , the beet : ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
beta
bēta (1) ae, f a beet (a vegetable), C., Ct. ...

An Elementary Latin Dictionary
Beta rays
·add. ·- Penetrating rays readily deflected by a magnetic or electric field, emitted by radioactive ...

Webster's Dictionary of the English Language