plan·ish 
(plănĭsh)
(plănĭsh)tr.v. plan·ished, plan·ish·ing, plan·ish·es
To smooth (metal) by rolling or hammering.
[Middle English *planishen, from Old French planir, planiss-, to make smooth, from plan, level, from Latin plānus; see pelə-2 in the Appendix of Indo-European roots.]
planish·er n.