1 definition found From The Collaborative International Dictionary of English v.0.44 [gcide]: Horseman \Horse"man\, noun; pl. {Horsemen}. 1. A rider on horseback; one skilled in the management of horses; a mounted man. 2. (Mil.) A mounted soldier; a cavalryman. 3. (Zo["o]l.) (a) A land crab of the genus {Ocypoda}, living on the coast of Brazil and the West Indies, noted for running very swiftly. (b) A West Indian fish of the genus {Eques}, as the light-horseman ({Eques lanceolatus}).

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