Buttresses reinforces and supports the outward thrusts of arches from the outside.
Buttress, in architecture, an exterior support, typically made of masonry, that projects from the face of a wall and serves to either strengthen it or resist the side thrust caused by the load on an arch or a roof.
The definition of a buttress is a support for a building usually made of brick or stone. A stone wall built against a wall to support the building is an example of a buttress
The flying buttress evolved from earlier simpler, hidden supports during the Gothic period.
It came to us from the Anglo-French (arche) boteraz.
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