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[moun-tn-uh s] /ˈmaʊn tn əs/
abounding in mountains:
a mountainous wilderness.
of the nature of a mountain.
resembling a mountain or mountains, as being very large and high:
mountainous waves.
Origin of mountainous
late Middle English
1400-50; late Middle English mounteynous. See mountain, -ous
Related forms
mountainously, adverb
mountainousness, noun
nonmountainous, adjective
nonmountainously, adverb
semimountainous, adjective
semimountainously, adverb
unmountainous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for mountainous
  • Large swaths of the state are also jagged and mountainous, with mountaintops frequently obscured by clouds.
  • Over one-third of the region's terrain is hilly and mountainous.
  • Conditions are humid around the coast but become considerably cooler and wetter toward the mountainous interior.
  • The northern side's mountainous terrain is rich in lush vegetation, while the southern area is flat and features sandy beaches.
  • The waves would have seemed mountainous from his swimmer's height.
  • At the same time, other rats breathed continuously in a low-oxygen atmosphere that replicated conditions in mountainous areas.
  • Some of those genes make it more suitable to cold, mountainous regions.
  • In mountainous regions, too, gazogenes firing wood allowed total autonomy of supply for forestry machines.
  • Both events were moderate in size and the strongest shaking was in unpopulated mountainous areas.
  • Eighty percent of the dingoes there are hybrids, and pure dingoes exist in only two remote, mountainous areas.
British Dictionary definitions for mountainous


of or relating to mountains: a mountainous region
like a mountain, esp in size or impressiveness
Derived Forms
mountainously, adverb
mountainousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for mountainous

late 14c., from Old French montagneux, from Vulgar Latin *montaneosus "mountainous," from *montanea (see mountain).

Online Etymology Dictionary, © 2010 Douglas Harper
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