a former state in W Germany, now part of Hesse.
German Hes·sen-Nas·sau [hes-uh n-nahs-ou] /ˈhɛs ənˈnɑs aʊ/.
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a former province of Prussia, now part of the state of Hesse, Germany
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012