The Collaborative International Dictionary of English v.0.48:

Miller \Mill"er\ (m[i^]l"[~e]r), 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]