According to Dictionary.com, a curved line is a type of line that continuously bends without any angles. In the United States, the curve is often portrayed as a central angle measured using degrees.
The word “curve” comes from Middle French. The Latin word curvus means curved, bent or crooked. Related forms of the word curved include: curv-ed-ly as an adverb, curv-ed-ness as a noun, curve-less or un-curved as an adjective. A curved line does not have straight parts, and the line continues in a bending fashion. Objects that curve include bends in a road or the contour of a human body.