maniac
adj.
c.1600, "pertaining to mania; insane," from French maniaque (14c.), from Late Latin maniacus, from Greek maniakos, from mania (see mania). Borrowed at first in French form; Latinized in English from 1727. The noun is attested from 1763, from the adjective.
〔李〕a. 疯狂的 [mani =madness] ←-ac [GK] 表示“属于…的；具有…性质的”