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1. Abbr. Mt. or Mtn. A natural elevation of the earth's surface having considerable mass, generally steep sides, and a height greater than that of a hill.
a. A large heap: a mountain of laundry.
b. A huge quantity: a mountain of trouble.
[Middle English mountaine, from Old French montaigne, muntaigne, from Vulgar Latin *montānea, from feminine of *montāneus, of a mountain, from Latin montānus, from mōns, mont-, mountain; see men- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. another term for mountainous
2. living in, located in, or related to mountains
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014