A native or inhabitant of the former republic of Czechoslovakia.

synonyms: Czech, Czechoslovak.

Dutch: Tsjech, Tsjechoslovaak, Tsjechoslowaak
Polish: Czechosłowak

Of or relating to Czechoslovakia or its people or their language:
— The Czechoslovakian population.

synonym: Czech.

Dutch: Tsjechoslowaaks
Polish: staroczeski