beltline

Etymology

From belt + line.

beltline means the imaginary line marking the upper end of the lower body of an automobile, running just below the bottoms of the windows. Lexicurio rates it Sui generis — a strength score of 91 out of 100.

noun

The imaginary line marking the upper end of the lower body of an automobile, running just below the bottoms of the windows“He also envisioned a car with a high beltline and exaggerated forms that visually suggested power, and at the same time promised solidity and security.”
A beltway: a circular expressway around a city