Crown-scab

(-skab.) (Pur.) A cancerous sore or pustule formed round the angles ofa horse's hoof. [s. 247] Crown -wheel. (Horol.) In common watches Crown -wheel. (Horol.) In common watches, the wheel which drives the escapement - wheel, or that which acts on the pallets.-(Mech.) A Crown-or Contrate-wheel is one which acts upon a common pinion, or a lantern, and to which rotary motion is communicated by means of cogs placed parallel to the axis. [s. 247]