rectilineal ( synonym found)
Definition of rectilineal:

°In a straight line.
"The crankshaft and connecting rods of an engine convert the rectilinear motion of the pistons to rotary motion of the flywheel."
°Formed from straight lines.
Definition of rectilineal:

°In a straight line.
"The crankshaft and connecting rods of an engine convert the rectilinear motion of the pistons to rotary motion of the flywheel."
°Formed from straight lines.
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