out-of-round
/ˌaʊtəvˈraʊnd/adjective
Of an object: not perfectly circular, cylindrical, or spherical.
noun
Mechanics. The quality of departing from being exactly circular in section, on the part of a cylindrical or circular manufactured object; specifically the extent of this.
Origin
Mid 18th century; earliest use found in John Desaguliers (1683–1744), natural philosopher and engineer. From out of + round.