complanate

from The Century Dictionary.

• To make level; reduce to an even surface.
• Flattened; made level, or with a smooth surface.
• In botany, lying in one plane: applied to leaves, especially of mosses.
• In entomology, appearing as if flattened by pressure: applied to plane surfaces continuous with higher and convex or irregular parts: as, a complanate margin or disk in a convex pronotum.

from the GNU version of the Collaborative International Dictionary of English.

• adjective rare Flattened to a level surface.
• transitive verb rare To make level.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb transitive To make level.