noun
curvilinear coordinates
A coordinate system for Euclidean space where the coordinate lines may be curved. Used in mathematics and physics.
曲線座標を用いると、問題が簡単になることがある。
Using curvilinear coordinates can sometimes simplify the problem.
直交座標 (orthogonal coordinates) is a broader class; curvilinear coordinates are a type of orthogonal coordinates where the coordinate lines are not necessarily straight.
Compound of 曲線 (curve) and 座標 (coordinates).