trimming curve
Technical term in computer graphics and CAD, referring to a curve used to trim or define the boundary of a surface or solid.
In CAD software, use trimming curves to trim the surface.
Compound of 輪郭 (りんかく, 'outline') + 線 (せん, 'line') + 要素 (ようそ, 'element'). The exact derivation is uncertain; the term is a technical calque or coined compound in computer graphics.