noun Chemistry.

  1. a white crystalline substance, C6H7NO, occurring in three isomers, meta-, ortho-, and para-aminophenol: used as an intermediate for dyes and as a photographic developer.


  1. chem any of three isomeric forms that are soluble crystalline solids, used as a dye intermediate (meta- and ortho-), in dyeing hair, fur, and textiles (ortho- and para-), and as a photographic developer (para-). Formula: C 6 H 4 NH 2 OH
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