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-2 in the Appendix of Indo-European roots.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.