Rider (rīdˈẽr), n.
1. One who, or that which, rides.
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2. Formerly, an agent who went out with samples of goods to obtain orders; a commercial traveler. [Eng.]
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3. One who breaks or manages a horse. Shak.
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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.
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After the third reading, a foolish man stood up to propose a rider. Macaulay.
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This [question] was a rider which Mab found difficult to answer. A. S. Hardy.
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5. (Math.) A problem of more than usual difficulty added to another on an examination paper.
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6. [D. rijder.] A Dutch gold coin having the figure of a man on horseback stamped upon it.
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His moldy money ! half a dozen riders. J. Fletcher.
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7. (Mining) Rock material in a vein of ore, dividing it.
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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.
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9. (Naut.) The second tier of casks in a vessel's hold.
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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.
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11. A robber. [Obs. or Prov. Eng.] Drummond.
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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.
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