1) Of an old British people 2) Old language of scotland 
• (a.) Of or pertaining to Picts; resembling the Picts.
Pict'ish adjective Of or pertaining to Picts; resembling the Picts. 'The Pictish peer.' Byron. 
Pictish 1. Of or relating to the Picts or their language or culture. 2. The language of the Picts, of uncertain affiliation, known chiefly from place names and extinct by the tenth century.