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delphinium
Delphinus
Delray Beach
Delta
delta
delta blues
Delta Force
delta ray
delta wave
delta wing
deltiology
deltoid
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delta wave

del·ta wave (plural del·ta waves) or del·ta rhythm (plural del·ta rhythms)


noun 
Definition:
 
brain wave: a slow brain wave that is produced by adults in deep sleep. Delta waves are produced in the front of the brain and have a frequency of 3.5 cycles per second.

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