Русско-англо-русский юридический словарь

While the Shorter Oxford English Dictionary (1933 Edition) has this entry for ship: "A large seagoing vessel (opp. to a boat); spec, (in modern times) a vessel having a bowsprit and three masts, each of which consists of a lower, top and topgallant mast". (Response of the Irish Maritime Law Association)

A prison ship, often more accurately described as a prison hulk, is a current or former seagoing vessel that has been modified to become a place of substantive detention for convicts, prisoners of war or civilian internees. (Wikipedia)