Parabolas pl. : of Parabola

Example:
How does the Parabolas in car headlights allow them to work?

Taxonomy
parabola, Vertex of a parabola, directrix, equation, axis, axis of symmetry, perpendicular, tangent, shape, the distance, y-axis, bounce, approximation, orbits, latus rectum, physical world, mirror, principle.

Defination from the web:
parabola (pronounced /pəˈræbələ/, from the Greek παραβολή) is a conic section, the intersection of a right circular conical ... He discovered a way to solve the problem of doubling the cube using parabolas. ...