Main Entry: ¹di·ag·o·nal

Pronunciation: \dī-ˈa-gə-n^əl, -ˈag-nəl\

Function: adjective

Etymology: Latin diagonalis, from Greek diagōnios from angle to angle, from dia- + gōnia angle; akin to Greek gony knee — more at knee

Date: 1563

1 a : joining two vertices of a rectilinear figure that are nonadjacent or two vertices of a polyhedral figure that are not in the same face b : passing through two nonadjacent edges of a polyhedron <a diagonal plane>
2 a : inclined obliquely from a reference line (as the vertical) <wood with a diagonal grain> b : having diagonal markings or parts <a diagonal weave>