alpha wave

World English Dictionary
alpha rhythm or alpha wave
 
n
physiol See also brain wave the normal bursts of electrical activity from the cerebral cortex of a drowsy or inactive person, occurring at a frequency of 8 to 12 hertz and detectable with an electroencephalograph
 
alpha wave or alpha wave
 
n

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Dictionary.com's 21st Century Lexicon
Main Entry:  alpha wave
Part of Speech:  n
Definition:  a normal rhythmic electrical pattern of 8-13 hertz (cycles per second) in a wakeful relaxed human brain; also called alpha rhythm
Etymology:  1930-35
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American Heritage
Medical Dictionary

alpha wave n.
See alpha rhythm.

The American Heritage® Stedman's Medical Dictionary
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