WordNet (r) 3.0 (2006):

Kalka
    n 1: the Mongol people living in the central and eastern parts
         of Outer Mongolia [syn: Khalkha, Khalka, Kalka]
    2: the language of the Khalkha that is the official language of
       the Mongolian People's Republic [syn: Khalkha, Khalka,
       Kalka]