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beta decay
beta emission
beta-lactam inhibitor
beta-oxidation
beta particle
beta process
beta ray
beta-receptor
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beta rhythm
be·ta rhythm (plural be·ta rhythms)


noun 
Definition:
 
pattern of brain waves: a pattern of electrical waves in the brain of somebody who is awake and active, registering on an electroencephalogram at a reading between 18 and 30 hertz
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