The Collaborative International Dictionary of English v.0.48:
Cavalryman \Cav"al*ry*man\, n.; pl. Cavalrymen. One of a body of cavalry. [1913 Webster]WordNet (r) 3.0 (2006):
cavalryman n 1: a soldier in a motorized army unit [syn: cavalryman, trooper] 2: a soldier mounted on horseback; "a cavalryman always takes good care of his mount" [syn: cavalryman, trooper]