n. 1. One who keeps or attends a flour mill or gristmill. [ 1913 Webster ]

2. A milling machine. [ 1913 Webster ]

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. ] [ 1913 Webster ]

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. ] [ 1913 Webster ]

n. A believer in the doctrine of William Miller (d. 1849), who taught that the end of the world and the second coming of Christ were at hand. [ 1913 Webster ]

n. [ From W. H. Miller, of Cambridge, Eng. ] (Min.) A sulphide of nickel, commonly occurring in delicate capillary crystals, also in incrustations of a bronze yellow; -- sometimes called hair pyrites. [ 1913 Webster ]