contour line

a line joining points of equal elevation on a surface.
the representation of such a line on a map.
Mathematics. a line parallel to a trace. Compare trace1 ( def 11 ).
Also called contour, level curve, level line.

1835–45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
contour line
Often shortened to: contour a line on a map or chart joining points of equal height or depth

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
contour line   (kŏn'tr')  Pronunciation Key 

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A line on a map joining points of equal elevation above a given level, usually mean sea level. ◇ The change in elevation between one contour line and the next is the contour interval.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Your land may be steep or irregular enough that you have more than one key
  contour line.
Trees along this line are felled on the upstream side of the contour line as
  much as possible.
Any point on a contour line is the same elevation as all the other points on
  the same line.
Think of a contour line as an imaginary line on the ground that takes any path
  necessary to maintain constant elevation.
Image for contour line
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