Priming

Definition:

(p. pr. & vb. n.) of Prime
(n.) The powder or other combustible used to communicate fire to a charge of gunpowder, as in a firearm.
(n.) The first coating of color, size, or the like, laid on canvas, or on a building, or other surface.
(n.) The carrying over of water, with the steam, from the boiler, as into the cylinder.

Compare priming with other words:

primine vs. priming