Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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beta blocker any of a class of drugs that inhibit the absorption of adrenalin and the activity of the autonomic nervous system, and are used to control the heartbeat and relieve angina and hypertension.
beta particle a high-speed positron or electron ejected from a nucleus in radioactive decay or fission.
beta ray a stream of beta particles, esp. those with a negative charge.
Phi Beta Kappa a national honor society whose members are chosen annually from among undergraduates in the arts and sciences who have achieved academic distinction. [2 definitions]