noun

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

   “the low drag contour of a modern automobile”

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

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

Synonyms: contour line

verb

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

2. To mark with contour lines.

3. To practise the makeup technique of contouring.