diaped

diaped Geom.

(ˈdaɪəpɛd)

[as if ad. Gr. *διάπεδον, f. διά through + πεδ- in πέδον ground, πεδίον plain, ἐπίπεδος plane.]

The line in which any two non-contiguous planes of a polyhedron intersect.

In mod. Dicts.