American Dictionary of the English Language

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RI'DER, noun

1. One who is borne on a horse or other beast, or in a vehicle.

2. One who breaks or manages a horse.

3. The matrix of an ore.

4. An inserted leaf or an additional clause, as to a bill in parliament.

5. In ship building, a short of interior rib fixed occasionally in a ships's hold, opposite to some of the timbers to which they are bolted, and reaching from the keelson to the beams of the lower deck, to strengthen her frame.