2.
A milling machine.
[1913 Webster]

3. (Zol.) (a)
A moth or lepidopterous insect; -- so called because the wings appear as if covered with white dust or powder, like a miller's clothes. Called also moth miller. (b)
The eagle ray. (c)
The hen harrier. [Prov. Eng.]
[1913 Webster]

Miller's thumb. (Zol.) (a) A small fresh-water fish of the genus Uranidea (formerly Cottus), as the European species (Uranidea gobio), and the American (Uranidea gracilis); -- called also bullhead. (b) A small bird, as the gold-crest, chiff-chaff, and long-tailed tit. [Prov. Eng.]
[1913 Webster]