Adirondack

From the Mohawk ratirontaks, atirú:taks, hatiron'taks (“they eat trees”), a term applied by the Mohawks indiscriminately to other tribes, including the French and English, but especially other Native Americans who ate bark and buds when other food sources were scarce.

Back-formation from Adirondacks. The mountains were named after the tribe.

Abbreviation.