nonant

Etymology
Borrowed from, accusative singular of.

Noun

 * 1) One of the nine sections made by dividing an area with two perpendicular sets of two parallel lines.
 * 2)  One ninth of a circle or disc; a sector with an angle of 40&deg;.
 * 3)  A theoretical measuring device with a graduated arc of 40&deg; used in locating an altitude.