n. 骑马者, 马术师, 养马者

Horseman \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. (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}).