Greek 'pyr' and English 'fire' are the same PIE root *peh2wr — separated only by Grimm's Law.
A person suffering from an irresistible urge to set fire to things; someone with an obsessive fascination with fire.
Formed from Greek 'pŷr' (fire, genitive 'pyrós') and 'manía' (madness, frenzy). The Greek 'pŷr' derives from PIE *péh₂wr̥ (fire), the same root that produced English 'fire' (through Germanic), 'pyre,' and 'pyrotechnics.' Greek 'manía' derives from PIE *men- (to think), the same root behind 'mind,' 'mental,' and 'mania.' The term was
The combining form 'pyro-' from Greek 'pŷr' (fire) and the English word 'fire' descend from the same PIE root *péh₂wr̥. The initial 'p' of the PIE root became 'f' in Germanic languages through Grimm's Law — the systematic sound shift that also turned PIE *p into Germanic *f in pairs like Latin 'pater' / English 'father' and Latin 'piscis' / English 'fish.' Greek kept the original 'p.'
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