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From The Collaborative International Dictionary of English v.0.48:
Grainer \Grain"er\ (gr[=a]n"[~e]r), n. 1. An infusion of pigeon's dung used by tanners to neutralize the effects of lime and give flexibility to skins; -- called also grains and bate. [1913 Webster] 2. A knife for taking the hair off skins. [1913 Webster] 3. One who paints in imitation of the grain of wood, marble, etc.; also, the brush or tool used in graining. [1913 Webster]