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py·ro·ma·nia .pī-rō-'mā-nē-ə, -nyə n an irresistible impulse to start fires
py·ro·ma·ni·a·cal -mə-'nī-ə-kəl adj
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n.
an excessively strong impulse to set things on fire.
• pyromaniac adj. n.
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py·ro·ma·nia (pi″ro-maґne-ə) [pyro- + -mania] [DSM-IV] an impulse control disorder characterized by the compulsion to set or watch fires in the absence of monetary or other gain, the act being preceded by tension or arousal and resulting in pleasure or relief.Medical dictionary. 2011.