pyro UK /ˈpaɪ.ɹəʊ/US /ˈpaɪ.ɹoʊ/noun 5adjective 2forms 3 noun5 •(slang) A pyromaniac. •(informal) Pyrotechnics. •(informal) A pyrotechnician. •Pyrocellulose. •(no longer used) Pyrogallol, pyrogallic acid. adjective2 •(informal) Pyrotechnic.“I had told the guy a couple of weeks earlier that the pyro flames were getting too close,” he laughs. — 2023 •(slang) Pyromaniac, pyromaniacal. formspyros · more pyro · most pyro