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betaine
betake
betamethasone
betatron
betaware
betaxolol
betcha
bete noire
betel
betel nut
betel palm
Betelgeuse
beth
Beth Din
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bethel
Bethel Park
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beta ray
be·ta ray (plural be·ta rays)


noun 
Definition:
 
stream of particles: a stream of beta particles
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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