མཐར་ཐུག །

mthar thug:

The etymology of the Tibetan word for “ultimate” (mthar thug) is “touching the end.” It is also synonymous with mthar phyin “arrived at the end” and mthas gtugs “touched with the end.” See the Thon mi’i dgongs rgyan (p. 162): mtha’ la son pa’am mtha’ la reg pa.