Contour-line definition

kŏnto͝or
A line on a map or chart connecting all points of the same elevation (or depth) in a particular area.
noun
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A line on a map that joins points of equal elevation.
noun
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A line on a map joining points of equal elevation above a given level, usually mean sea level. &diamf3; The change in elevation between one contour line and the next is the contour interval.
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(geography) A line on a map through points of equal elevation, often height above sea level.
noun
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Other Word Forms

Noun

Singular:
contour-line
Plural:
contour-lines