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rectilinear

adjective
 
 
/ˌrek.tɪˈlɪn.i.ər/ US  /-təˈlɪn.i.ɚ/ formal

Definition

moving in or formed from straight lines: a rectilinear street planDescribing angles, lines and orientations
(Definition of rectilinear adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of rectilinear