from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A type of electrical activity in the brain; brain waves with a frequency of 4-8 hertz.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude
theta + wave (Wiktionary)