curvilinear
adjective/ˌkɜːvɪˈlɪniə(r)/
/ˌkɜːrvɪˈlɪniər/
(formal)- consisting of a curved line or linesWord Originearly 18th cent.: from Latin curvus ‘bent, curved’, on the pattern of rectilinear.
Check pronunciation:
curvilinear