Horse″man (?), n.; 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. (Zoöl.) (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 (E. lanceolatus).