From The Collaborative International Dictionary of English v.0.48:
Milled \Milled\ (m[i^]ld), 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]
From The Collaborative International Dictionary of English v.0.48:
Mill \Mill\ (m[i^]l), v. t. [imp. & p. p. Milled (m[i^]ld); p.
pr. & vb. n. Milling.] [See Mill, n., and cf. Muller.]
[1913 Webster]
1. To reduce to fine particles, or to small pieces, in a
mill; to grind; to comminute.
[1913 Webster]
2. To shape, finish, or transform by passing through a
machine; specifically, to shape or dress, as metal, by
means of a rotary cutter.
[1913 Webster]
3. To make a raised border around the edges of, or to cut
fine grooves or indentations across the edges of, as of a
coin, or a screw head; also, to stamp in a coining press;
to coin.
[1913 Webster]
4. To pass through a fulling mill; to full, as cloth.
[1913 Webster]
5. To beat with the fists. [Cant] --Thackeray.
[1913 Webster]
6. To roll into bars, as steel.
[1913 Webster]
To mill chocolate, to make it frothy, as by churning.
[1913 Webster]