Definition of rectilinear adjective from the Oxford Advanced Learner's Dictionary

     

    rectilinear

     adjective
    adjective
    BrE BrE//ˌrektɪˈlɪniə(r)//
     
    ; NAmE NAmE//ˌrektɪˈlɪniər//
     
    (specialist)
     
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  1. 1in a straight line rectilinear motion
  2. 2having straight lines rectilinear forms
  3. Word Origin mid 17th cent.: from late Latin rectilineus (from Latin rectus ‘straight’ + linea ‘line’) + -ar.
See the Oxford Advanced American Dictionary entry: rectilinear