con'tour line"

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

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

contour intervalcontour map
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