rec·ti·lin·e·ar
adjective/ˌrektɪˈlɪniə(r)/
/ˌrektɪˈlɪniər/
(specialist)- in a straight line
直线的；笔直的 - rectilinear motion
直线运动
- rectilinear motion
- having straight lines
有直线的 - rectilinear forms
直线图形
- rectilinear forms
Word Originmid 17th cent.: from late Latin rectilineus (from Latin rectus ‘straight’ + linea ‘line’) + -ar.