Webster's English Dictionary

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celtic

1. Celt.ic \'sel-tik, 'kel-\ aj : of, relating to, or characteristic of the 
   Celts or their languages 
2. Celtic n : a group of languages closely related to the Italic, usu. 
   subdivided into  Brythonic and Goidelic, and confined to Brittany, Wales, 
   western Ireland, and the Scottish Highlands