De*vel"op*er (?), n.
1. One who, or that which, develops. 2. (Photog.) A reagent by the action of which the latent image upon a photographic plate, after exposure in the camera, or otherwise, is developed and visible. © Webster 1913
De*vel"op*er, n. One that develops; specif.: (a) (Photog.) A chemical bath or reagent used in developing photographs. (b) (Dyeing) A reagent used to produce an ingrain color by its action upon some substance on the fiber. © Webster 1913
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