Etymology
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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.

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Definitions of pyromaniac

pyromaniac (n.)
a person with a mania for setting things on fire;
From wordnet.princeton.edu