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

buttress

noun
 
/ˈbʌtrəs/
 
/ˈbʌtrəs/
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  1. a structure made of stone or brick that supports a wall
    • It was necessary to strengthen the building with large external buttresses.
    Topics Buildingsc2
    Word OriginMiddle English: from Old French (ars) bouterez ‘thrusting (arch)’, from boter ‘to strike or thrust’, of Germanic origin.
See buttress in the Oxford Advanced American Dictionary

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