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mountainside

[ moun-tn-sahyd ]
/ ˈmaʊn tnˌsaɪd /
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noun
the side or slope of a mountain.
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Which of the following nouns has an irregular plural form?

Origin of mountainside

1300–50; Middle English. See mountain, side1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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