The Collaborative International Dictionary of English v.0.48:
Privateersman \Pri`va*teers"man\ (pr[imac]`v[.a]*t[=e]rz"man), n.; pl. Privateersmen (pr[imac]`v[.a]*t[=e]rz"men). An officer or seaman of a privateer. [1913 Webster]WordNet (r) 3.0 (2006):
privateersman n 1: an officer or crew member of a privateer [syn: privateer, privateersman]