rectilinear

From post-Classical Latin; either from rectilīneāris or from rectilīneus (whence rectiline) + -ar, in both cases ultimately deriving from rectus (“straight”) + līnea (“line”).

rectilinear (comparative more rectilinear, superlative most rectilinear)

1. 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.

2. (geometry, art) Formed from straight lines.

• rectilinear in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• rectilinear at OneLook Dictionary Search