D defs.my
Entry 1 sense Webster, 1913

Peneplain

· Pe·ne·plain · IPA /ˈpiːnɪpleɪn/
01 n. A land surface reduced by erosion to the general condition of a plain, but not wholly devoid of hills; a base-level plain.
  1. 1.
    A land surface reduced by erosion to the general condition of a plain, but not wholly devoid of hills; a base-level plain.(Phys. Geog.)