diagonal
di-ag-o-nal
noun
A straight line connecting two non-adjacent vertices of a polygon or solid figure.
"The square has two diagonals."
adjective
Extending from one corner to the opposite corner, or at a slanting angle.
"She drew a diagonal line on the paper."
Thesaurus
Synonyms: aslant, slanting, slanted, aslope, sloping, inclined, sloped, oblique, solidus, slash, stroke, virgule