Etymology
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maniac (adj.)

c. 1600,  "affected with mania, raving with madness," from French maniaque (14c.), from Late Latin maniacus, from Greek maniakos, from mania (see mania). Borrowed at first in French form. From 1727 as "pertaining to mania." The noun, "one who is affected with mania, a madman," is attested by 1763, from the adjective.

updated on November 15, 2018

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Definitions of maniac from WordNet
1
maniac (n.)
an insane person;
Synonyms: lunatic / madman
maniac (n.)
a person who has an obsession with or excessive enthusiasm for something;
2
maniac (adj.)
wildly disordered;
Synonyms: maniacal
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.