Webster's Dictionary, 1913
 
 
Czech     noun   
  1.   One of the Czechs.    2.   The language of the Czechs (often called Bohemian), the harshest and richest of the Slavic languages. 
Czechic     adjective    Of or pertaining to the Czechs. "One  Czechic realm."  The Nation. 
Czechs     noun plural   ;  sing.   Czech  . [ Named after their chieftain,  Czech .]  (Ethnol.)  The most westerly branch of the great Slavic family of nations, numbering now more than 6,000,000, and found principally in Bohemia and Moravia.