The flying buttresses elements helps to support nave vaults by transferring their outward thrust over the aisles to massive, free-standing upright external butresses.
The flying buttresses is referred to as a form of buttress which is to be composed by an arch that extends from upper part of a wall to a greater mass in order to covey the forces to the ground that is to be necessary to push a wall outwards.
It simply meaning is flying. It is called flying buttresses because they support from the side or a building while having actual buttress open ti the ground.
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