contours
noun
Definitions
An outline, boundary or border, usually of curved shape.
Example: 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.
Synonyms:contour lineA speech sound which behaves as a single segment, but which makes an internal transition from one quality, place, or manner to another.