noun which may take the genitive case particle 'no'
non-circular
Technical term used in geometry, engineering, and design to describe shapes that are not circles or circular.
この部品は非円形の断面を持っている。
This part has a non-circular cross-section.
非円形歯車は特殊な動きを実現する。
Non-circular gears achieve special motions.
Means 'asymmetrical'; 非円形 specifically refers to shape not being circular, while 非対称 is broader.
Compound of 非 (hi, 'non-') + 円形 (enkei, 'circular shape'). A straightforward modern technical term.