Rider word meaning and definition

[noun] a clause that is appended to a legislative bill
[noun] a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
[noun] a traveler who actively rides an animal (as a horse or camel)
[noun] a traveler who actively rides a vehicle (as a bicycle or motorcycle)

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