n. One who derides, or laughs at, another in contempt; a mocker; a scoffer. [ 1913 Webster ]

n. member of a secret mounted band in the southern U. S. after the Civil War, which committed acts of intimidation and revenge.
Syn. -- night rider. [ WordNet 1.5 ]

n. 1. A summoner whose office is to cite men before the sheriff. [ Obs. ] [ 1913 Webster ]

2. One who rides out on horseback, beyond the main group, e. g., as a scout. Chaucer. [ 1913 Webster +PJC ]

3. A servant on horseback attending a carriage. [ 1913 Webster ]

n. 1. (Bot.) The outer layer of bark. [ 1913 Webster ]

2. (Zool.) The hard outer covering of hydroids and other marine animals; the perisarc. [ 1913 Webster ]

n. One who rides over a post road to carry the mails. Bancroft. [ 1913 Webster ]

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 ]

a. Having no rider; as, a riderless horse. H. Kingsley. [ 1913 Webster ]

n. 1. One who breaks horses; especially (Mil.), a noncommissioned officer in the British cavalry, whose duty is to assist the riding master. [ 1913 Webster ]

2. An officer or enlisted man in the 1st U. S. Volunteer Cavalry, a regiment raised for the Spanish war of 1898, composed mostly of Western cowboys and hunters and Eastern college athletes and sportsmen, largely organized, and later commanded, by Theodore Roosevelt. Sometimes, locally, a member of any of various volunteer cavalry commands raised in 1898. [ Colloq. ] [ Webster 1913 Suppl. ]