WordReference Random House Learner's Dictionary of American English © 2026
ma•ni•ac /ˈmeɪniˌæk/USA pronunciation
n. [countable]
ma•ni•a•cal•ly, adv.
WordReference Random House Unabridged Dictionary of American English © 2026- an insane person; lunatic.
- a person who is very enthusiastic or overly excited (about something):a maniac about neatness.
ma•ni•a•cal•ly, adv.
ma•ni•ac
(mā′nē ak′),USA pronunciation n.
adj.
WordReference Random House Unabridged Dictionary of American English © 2026- a raving or violently insane person;
lunatic. - any intemperate or overly zealous or enthusiastic person:a maniac when it comes to details.
adj.
- maniacal.
- Medieval Latin maniacus of, pertaining to madness. See mania, -ac
- 1595–1605
ma•ni•a•cal
(mə nī′ə kəl),USA pronunciation adj.
ma•ni′a•cal•ly, adv.
- of or pertaining to mania or a maniac.
- maniac + -al1 1670–80