Photography. A chemical agent used to develop photographs.

a white or reddish crystalline compound, C6H4(NH2)2, used as a photographic developer, for dyeing hair and fur, and in the manufacture of dyes…

A proprietary name for: a liquid for developing black and white photographs, based on 4-aminophenol hydrochloride and sold in a concentrated form…

A crystalline derivative of glycine, used as a developer; p-hydroxyphenylaminoacetic acid.

A trade name for a salt of diamidophenol, used as a developer in photography.

A photographic developer containing chlorohydroquinone, C6H5O2Cl.

colloquial or slang. Photography and Cinematography. A processing chemical, esp. the developer.

a photographic developer formulated to increase the acutance of the developed image.