How do you spell Grainer

Available Definitions:
1)  n. - 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.
2)  n. - A knife for taking the hair off skins.
3)  n. - One who paints in imitation of the grain of wood, marble, etc.; also, the brush or tool used in graining.