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- DictionaryFly·ing but·tress/ˌflīiNG ˈbətrəs/
noun
- 1. a buttress slanting from a separate pier, typically forming an arch with the wall it supports.
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The flying buttress is a specific form of buttress composed of an arch that extends from the upper portion of a wall to a pier of great mass, in order to convey to the ground the lateral forces that push a wall outwards, which are forces that arise from vaulted ceilings of stone and from wind-loading on roofs. Wikipedia