1. mountain skink frequents oak and pine habitats in rocky mountainous areas of United States southwest and Mexico
  2. mountain bike a bicycle with a sturdy frame and fat tires
  3. mountaineering the activity of climbing a mountain
  4. mountain chain a series of hills or mountains
  5. mountain birch birch of western United States resembling the paper birch but having brownish bark
  6. mountain pine tall pine of western North America with stout blue-green needles; bark is grey-brown with rectangular plates when mature
  7. mountain range a series of hills or mountains
  8. mountain blacksnake large harmless shiny black North American snake
  9. mountain ebony small East Indian tree having orchid-like flowers and hard dark wood
  10. mountain box evergreen mat-forming shrub of North America and northern Eurasia having small white flowers and red berries; leaves turn red in autumn
  11. mountain sickness nausea and shortness of breath experienced by mountain climbers above ten thousand feet
  12. mountain spinach Asiatic plant resembling spinach often used as a potherb
  13. mountain peak the summit of a mountain
  14. mountain paca rodent of mountains of western South America
  15. unthinking not exhibiting or characterized by careful thought
  16. mountain lion large American feline resembling a lion
  17. mountain climbing the activity of climbing a mountain
  18. mountain mint any of a number of perennial herbs of the genus Pycnanthemum
  19. mountain beaver bulky nocturnal burrowing rodent of uplands of the Pacific coast of North America; the most primitive living rodent
  20. mountebank a flamboyant deceiver