planum
From LSJ
ἐν πίθῳ τὴν κεραμείαν μανθάνειν → in breaking many pots, the potter learns his craft | of those who undertake the most difficult tasks without learning the elements of the art | don't run before you can walk
Latin > English (Lewis & Short)
plānum: i, n., v. planus, I. B.
Latin > English
planum plani N N :: plan (drawing)