Etymology
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Words related to pyromania

pyro- 

before vowels pyr-, word-forming element form meaning "fire," from Greek pyr (genitive pyros) "fire, funeral fire," also symbolic of terrible things, rages, "rarely as an image of warmth and comfort" [Liddell & Scott], from PIE root *paewr- "fire." Pyriphlegethon, literally "fire-blazing," was one of the rivers of Hell.

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mania (n.)

late 14c., "mental derangement characterized by excitement and delusion," from Late Latin mania "insanity, madness," from Greek mania "madness, frenzy; enthusiasm, inspired frenzy; mad passion, fury," related to mainesthai "to rage, go mad," mantis "seer," menos "passion, spirit," all of uncertain origin, perhaps from PIE *mnyo-, suffixed form of root *men- (1) "to think," with derivatives referring to qualities and states of mind or thought.

Mania is manifested by psychic elevation, increased motor activity, rapid speech and the quick flight of ideas. [Scientific American, September 1973]

Sense of "fad, craze, enthusiasm resembling mania, eager or uncontrollable desire" is by 1680s, from French manie in this sense. Sometimes nativized in Middle English as manye. Used since 1500s as the second element in compounds expressing particular types of madness (such as nymphomania, 1775; kleptomania, 1830; megalomania, 1890), originally in Medical Latin, in imitation of Greek, which had a few such compounds, mostly post-classical: gynaikomania (women), hippomania (horses), etc.

incendiarism (n.)
1670s; see incendiary + -ism. Originally figurative; the literal sense of "malicious burning" is attested from 1755.
*paewr- 
*paəwr-, Proto-Indo-European root meaning "fire."

It forms all or part of: antipyretic; burro; empyreal; empyrean; fire; pyracanth; pyre; pyretic; pyrexia; pyrite; pyro-; pyrolusite; pyromania; pyrrhic; sbirro.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit pu, Hittite pahhur "fire;" Armenian hur "fire, torch;" Czech pyr "hot ashes;" Greek pyr, Umbrian pir "fire;" Old English fyr, German Feuer "fire."
pyromaniac (adj.)

"of, pertaining to, characterized by, or affected with pyromania," 1855, from pyromania. As a noun from 1861, "person possessed of an irresistible impulse to burn things." Related: Pyromaniacal.