engrain definition by Webster's New World
Origin: Middle English engreinen ; from Old French engrainer, to dye scarlet ; from en- (see en-) plush graine, seed, cochineal dye; associated, association in both French and amp; eastern; English with grain (texture): see grain
engrain definition by American Heritage Dictionary
transitive verb en·grained, en·grain·ing, en·grains
Origin: Middle English engreinen, to dye with cochineal or kermes, from Old French engrainer : en-, causative pref.; see en-1 + graine, grain; see grain.