D defs.my
Entry 1 sense Webster, 1913

Crown wheel

/(hw?l`)/ · Crown· wheel · IPA
01 A wheel with cogs or teeth set at right angles to its plane; -- called also a contrate wheel or face wheel.
  1. 1.
    A wheel with cogs or teeth set at right angles to its plane; -- called also a contrate wheel or face wheel.(Mach.) Also: contrate wheel, face wheel