English
maniac
From mania + -ac.
Formed from mania + -ac
Proto-Indo-European *men- ‘to think, mind’
…
Proto-Hellenic *məňňómai
Ancient Greek μαίνομαι ‘to rage’
Ancient Greek μᾰνῐ́ᾱ ‘madness’
Latin mania
English mania
Today it means
noun An insane person, especially one who suffers from a mania.
Language periods are conventional ranges, not dates for this word.
Etymograph / maniac