ธันวาคม

Etymology
From 🇰🇲; literally "arrival of the bow (Sagittarius)"; believed to have been (1858–1923) together with  (1822–1891); first used officially in the edict of  dated 1 April 1890.

Proper noun

 * 1) (เดือน~, ~มาส) December: the twelfth month of the year under the solar calendar.