different between peneplain vs pediment

English

From pene- +? plain.

peneplain (plural peneplains)

(geomorphology) A low-relief plain representing the final stage of fluvial erosion during times of extended tectonic stability.

From the earlier form peremint, perhaps a dialectal alteration of pyramid, under the influence of -ment.

pediment (plural pediments)

(architecture) A classical architectural element consisting of a triangular section or gable found above the horizontal superstructure (entablature) which lies immediately upon the columns; fronton.

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