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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.