n. 1. One who, or that which, rides. [ 1913 Webster ] 2. Formerly, an agent who went out with samples of goods to obtain orders; a commercial traveler. [ Eng. ] [ 1913 Webster ] 3. One who breaks or manages a horse. Shak. [ 1913 Webster ] 4. An addition or amendment to a manuscript or other document, which is attached on a separate piece of paper; in legislative practice, an additional clause annexed to a bill while in course of passage; something extra or burdensome that is imposed. [ 1913 Webster ] After the third reading, a foolish man stood up to propose a rider. Macaulay. [ 1913 Webster ] This [ question ] was a rider which Mab found difficult to answer. A. S. Hardy. [ 1913 Webster ] 5. (Math.) A problem of more than usual difficulty added to another on an examination paper. [ 1913 Webster ] 6. [ D. rijder. ] A Dutch gold coin having the figure of a man on horseback stamped upon it. [ 1913 Webster ] His moldy money ! half a dozen riders. J. Fletcher. [ 1913 Webster ] 7. (Mining) Rock material in a vein of ore, dividing it. [ 1913 Webster ] 8. (Shipbuilding) An interior rib occasionally fixed in a ship's hold, reaching from the keelson to the beams of the lower deck, to strengthen her frame. Totten. [ 1913 Webster ] 9. (Naut.) The second tier of casks in a vessel's hold. [ 1913 Webster ] 10. A small forked weight which straddles the beam of a balance, along which it can be moved in the manner of the weight on a steelyard. [ 1913 Webster ] 11. A robber. [ Obs. or Prov. Eng. ] Drummond. [ 1913 Webster ]
Rider's bone (Med.), a bony deposit in the muscles of the upper and inner part of the thigh, due to the pressure and irritation caused by the saddle in riding. [ 1913 Webster ]
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