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From Biology-Online Dictionary
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1. A rider on horseback; one skilled in the management of horses; a mounted man.

2. A mounted soldier; a cavalryman.

3. (Science: zoology) a land crab of the genus Ocypoda, living on the coast of Brazil and the west indies, noted for running very swiftly. A west indian fish of the genus Eques, as the light-horseman (E. Lanceolatus).