isocline

/ˈaɪsəˌklaɪn/
noun
  1. A line on a map or graph connecting points of equal slope or inclination, especially in geology or mathematics.
    • On the topographic map, each isocline indicated a uniform gradient.
    • The math teacher drew an isocline to show where the slope of the function was constant.
    • Geologists use isoclines to identify areas where rock layers have the same tilt.
  2. A fold in rock layers where both sides are tilted at the same angle.
    • Hikers could see the isocline exposed in the cliff face.
    • The isocline formed millions of years ago during a period of intense pressure.
    • The mountain's isocline revealed a symmetrical fold in the bedrock.
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