Related Clues:

• Lead-in to sine, cosine, or tangent
• Flattened-out circle
• Shot-put path
• A pop-up has one
• Parabola, for one
• A jump shot forms one
• Round rim needed different sort of shape
• A conic section
• Part of circle a councillor set up
• It looks like something may be thrown in this section
• Bow from a Catholic
• A curve; a discharge
• A section of the Circle Line
• Luminous discharge
• Section of curve in semicircular canal