wheel window; rose window
Rare architectural term for a circular window with radiating tracery, often found in Gothic churches. The cross-reference バラ窓 is a more common synonym.
See also: バラ窓
There is a beautiful wheel window on the facade of that cathedral.
Compound of 車輪 (wheel) and 窓 (window), describing the wheel-like radiating spokes of a rose window.