ピロガロールピロガロールMeanings1nounpyrogallolchemistryA chemical compound used as a photographic developer, in hair dyes, and as an oxygen absorbent. Domain-specific chemistry term.ピロガロールは写しゃ真しんの現げん像ぞう液えきに使つかわれることがある。Pyrogallol is sometimes used in photographic developers.