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Definition of boulder noun from the Oxford Advanced Learner's Dictionary

boulder

noun
 
/ˈbəʊldə(r)/
 
/ˈbəʊldər/
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  1. a very large rock which has been shaped by water or the weather
    • huge granite boulders underneath the cliff
    • fallen rocks and boulders
    • As the ice sheet rode over the land, huge boulders were ripped from the underlying rock.
    Topics Geographyc2
    Word Originlate Middle English: shortened from earlier boulderstone, of Scandinavian origin.
See boulder in the Oxford Advanced American Dictionary

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