We found 19 dictionaries that define the word theta rhythm:

General (12 matching dictionaries)

1. theta rhythm: Merriam-Webster
2. theta rhythm: Oxford Learner's Dictionaries
3. theta rhythm: American Heritage Dictionary of the English Language
4. theta rhythm: Vocabulary.com
5. theta rhythm: Wiktionary
6. theta rhythm: Infoplease Dictionary
7. theta rhythm: Dictionary.com
8. Theta rhythm: Wikipedia, the Free Encyclopedia
9. theta rhythm: Rhymezone
10. theta rhythm: FreeDictionary.org
11. theta rhythm: Mnemonic Dictionary
12. theta rhythm: TheFreeDictionary.com

Business (1 matching dictionary)

13. theta rhythm: Legal dictionary

Computing (1 matching dictionary)

14. theta rhythm: Encyclopedia

Medicine (5 matching dictionaries)

15. theta rhythm: Merriam-Webster Medical Dictionary
16. Dorland's Illustrated Medical Dictionary (No longer online)
17. Medical Dictionary (No longer online)
18. online medical dictionary (No longer online)
19. theta rhythm, rhythm, theta: Medical dictionary

(Note: See theta_rhythms as well.)

Definitions from Wiktionary (theta rhythm) ▸ noun:  A type of electrical activity in the brain: brain waves with a frequency of 4-8 hertz. Similar: theta wave, rhythmometry, rhythm, rhythmography, escape rhythm, rhythmogram, rathymia, isorhythm, rhythmus, rhythmite, more... ▸ Words similar to theta rhythm ▸ Usage examples for theta rhythm ▸ Idioms related to theta rhythm ▸ Wikipedia articles (New!) ▸ Words that often appear near theta rhythm ▸ Rhymes of theta rhythm ▸ Invented words related to theta rhythm