flying buttress
noun/ˌflaɪɪŋ ˈbʌtrəs/
/ˌflaɪɪŋ ˈbʌtrəs/
(architecture)- a half arch of stone that supports the outside wall of a large building such as a churchTopics Buildingsc2
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flying buttress
Definition of flying buttress noun from the Oxford Advanced Learner's Dictionary