contour

An outline, boundary or border, usually of curved shape.

“the low drag contour of a modern automobile”

A line on a map or chart delineating those points which have the same altitude or other plotted quantity: a contour line or isopleth.

A speech sound which behaves as a single segment, but which makes an internal transition from one quality, place, or manner to another.

To form a more or less curved boundary or border upon.

To mark with contour lines.

To practise the makeup technique of contouring.