Mill·er n.
 1. One who keeps or attends a flour mill or gristmill.
 2. A milling machine.
 3. Zool. (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.]
 Miller's thumb. Zool. (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.]

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