pyrogallol

 
Pronunciation: /ˌpʌɪrə(ʊ)ˈgalɒl/

noun

[mass noun] Chemistry
  • a weakly acid crystalline compound chiefly used as a developer in photography. Also called pyrogallic acid.
    • Alternative name: 1,3,5-trihydroxybenzene; chemical formula: C6H3(OH)3