Illyrian

1. not comparableOf or pertaining to Illyria or Illyrians.
2. not comparableOf or in the Illyrian language.
3. historicalnot comparableobsoleteOf or in the Serbo-Croatian language.

   The preface contains a defense of the Illyrian language and a list of the major Slavic “dialects” (Russian, Polish, Bohemian, Illyrian).

   2016, Edward Stankiewicz, Grammars and Dictionaries of the Slavic Languages from the Middle Ages Up to 1850: An Annotated Bibliography, page 80

   2 more examples

   Scholars divide the great bulk of the Slavic languages into two branches […] The south-eastern or eastern division contains the Russian, Bulgarian, and Illyrian languages

   1855, “Europe”, in Encyclopedia Britannica, Eighth Edition, volume 9, page 391

   The Slavic dialect used was examined by a very gifted poet, Gion Palmotich (1606–1657) , who attempts to identify the Dalmatian or Illyrian language (i. e., Serbo-Kroatian) with the Czech of Bohemia, which had been recognized by Charles the Fourth, in his Golden Bull (1355), as necessary for imperial princes to learn.

   1919, Paul Rankov Radosavljevich, Who are the Slavs? A Contribution to Race Psychology, pages 198–199

1. An extinct Indo-European language or group of languages spoken in modern Southeastern Europe, in the western half of the Balkan Peninsula.
2. historicalobsoleteThe Serbo-Croatian language.

   The preface contains a defense of the Illyrian language and a list of the major Slavic “dialects” (Russian, Polish, Bohemian, Illyrian).

   2016, Edward Stankiewicz, Grammars and Dictionaries of the Slavic Languages from the Middle Ages Up to 1850: An Annotated Bibliography, page 80

3. geographyA sub-age from 240 ± 2.0 to 237 ± 2.0 million years ago, a subdivision of the Triassic.

plural Illyrians

1. An inhabitant of ancient Illyria.
2. An inhabitant of Roman province of Illyricum (Illyro-Roman).
3. obsoleteA South Slav, especially a Croat, used in 17th-19th centuries.
4. uncommonA Proto-Albanian.
5. historicalA member of the Illyrian movement, a pan-South-Slavic cultural and political campaign.