a. 1. Having been subjected to some process of milling. [ 1913 Webster ]
2.Specifically: Having multiple fine grooves on the rim, in the direction from obverse to reverse; -- of coins. Coins of silver and gold were milled to make it impossible for uncrupulous persons to shave small pieces from the edge without detection. [ PJC ]
Milled cloth, cloth that has been beaten in a fulling mill. -- Milled lead, lead rolled into sheets. [ 1913 Webster ]