Geometric - a flying stair whose inner edge is curved.
Newel - central post supporting a spiral stair, also the main posts at the beginning and end of a flight of stairs, carrying the handrail.
Flying stair: cantilevered from the walls of a stairwell, without newels; sometimes called a Geometric stair when the inner edge describes a curve.
A buttress which transmits the thrust to a heavy support (abutment) by means of an arch or half-arch.Flying stairA stair with one or more flights unsupported by a wall on either side.Foil ...
 See also: Church, Flying buttress, Abutment, Arch, Chapel
  
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