'Developer' definitions:

Definition of 'developer'

From: WordNet
noun
Someone who develops real estate (especially someone who prepares a site for residential or commercial use)
noun
Photographic equipment consisting of a chemical solution for developing film

Definition of 'Developer'

From: GCIDE
  • Developer \De*vel"op*er\, n.
  • 1. One who, or that which, develops. [1913 Webster]
  • 2. (Photog.) A chemical bath or reagent used in developing photographs.
  • Note: By the action of the developer, the latent image on a photographic plate or film, not perceptible to the eye after exposure in the camera, is developed and becomes visible. [1913 Webster +PJC]
  • 3. (Dyeing) A reagent used to produce an ingrain color by its action upon some substance on the fiber. [Webster 1913 Suppl.]
  • 4. a corporation or individual who finances or organizes a real estate development[5]. [PJC]