n. A compulsive disorder characterised by obsession with fire or uncontrollable urges to start fires.
the GNU version of the Collaborative International Dictionary of English
n. An insane disposition to incendiarism.
The Century Dictionary and Cyclopedia
n. A mania for destroying things by fire; a form of insanity marked by a mania for setting things on fire.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an uncontrollable desire to set fire to things
Word Usage
"At one time it was assumed that there was a mental disorder known as pyromania; the pyromaniac was one with an irresistible impulse to light incendiary fires."