reichs·mark 
(rīksmärk′, rīs-)
(rīksmärk′, rīs-)n. pl. reichsmark or reichs·marks
A German unit of currency from 1925 to 1948.
[German : Reichs, genitive of Reich, realm (from Middle High German rīch, from Old High German rīchi; see reg- in the Appendix of Indo-European roots) + Mark, unit of currency (from Middle High German marke; see MARK2).]