three-quarter turn stair
noun
a staircase requiring a three-quarter turn at each landing for continued ascent or descent.
Origin of three-quarter turn stair
First recorded in 1960–65
Words nearby three-quarter turn stair
three-quarter,
three-quarter armor,
three-quarter binding,
three-quarter nelson,
three-quarter time,
three-quarter turn stair,
three-ring circus,
three-speed,
three-spot,
three-square,
three-star