We found 30 dictionaries that define the word maniacal:

General (24 matching dictionaries)

1. maniacal: Longman Dictionary of Contemporary English
2. maniacal: Merriam-Webster
3. maniacal: Oxford Learner's Dictionaries
4. maniacal: American Heritage Dictionary of the English Language
5. maniacal: Collins English Dictionary
6. maniacal: Vocabulary.com
7. Maniacal, maniacal: Wordnik
8. maniacal: Cambridge Advanced Learner's Dictionary
9. maniacal: Wiktionary
10. maniacal: Webster's New World College Dictionary, 4th Ed.
11. maniacal: The Wordsmyth English Dictionary-Thesaurus
12. maniacal: Infoplease Dictionary
13. maniacal: Dictionary.com
14. Maniacal (album), Maniacal (film): Wikipedia, the Free Encyclopedia
15. Maniacal: Online Plain Text English Dictionary
16. maniacal: Webster's Revised Unabridged, 1913 Edition
17. maniacal: Rhymezone
18. Maniacal: AllWords.com Multi-Lingual Dictionary
19. maniacal: Webster's 1828 Dictionary
20. maniacal: FreeDictionary.org
21. maniacal: Mnemonic Dictionary
22. maniacal: TheFreeDictionary.com

Art (1 matching dictionary)

23. -maniacal: A Cross Reference of Latin and Greek Elements

Business (1 matching dictionary)

24. maniacal: Legal dictionary

Computing (1 matching dictionary)

25. maniacal: Encyclopedia

Medicine (3 matching dictionaries)

26. maniacal: Merriam-Webster Medical Dictionary
27. online medical dictionary (No longer online)
28. maniacal: Medical dictionary

(Note: See maniacally as well.)

Definitions from Wiktionary ( ) ▸ adjective:  Like a maniac; insane; frenzied. Similar: insane, maniac, manic, frenetic, insaniac, frenzy, frantic, crazed, manicky, fanatic, more... Opposite: sane, calm, composed, reasonable, sober Phrases: maniacal laugh, maniacal smile, dangerous maniacal, more... Colors:     blood red,     electric blue,     neon green,     fiery orange,     toxic purple, more... ▸ Words similar to maniacal ▸ Usage examples for maniacal ▸ Idioms related to maniacal ▸ Wikipedia articles (New!) ▸ Popular nouns described by maniacal ▸ Words that often appear near maniacal ▸ Rhymes of maniacal ▸ Invented words related to maniacal