quintant

Etymology
Borrowed from, accusative singular of.

Noun

 * 1)  An instrument used for measuring angular distance, capable of measuring angles of up to 72 or 144 degrees.
 * 2)  A fifth of a circle.
 * 1)  A fifth of a circle.
 * 1)  A fifth of a circle.
 * 1)  A fifth of a circle.