Digon
noun ·Rare ·Advanced level
Definitions
- 1 A polygon having two edges and two vertices.
"They [the students] also came upon new and unusual mathematical figures: the digon, a two-sided polygon on a spherical space, and the apeirogon, an open polygon with infinitely many sides […]. All these discoveries brought up even more questions. Is a circle a polygon? What makes an octagon an octagon – its eight vertices, its eight sides, or both? Can a polygon cross itself? Does a polygon need to be closed?"
- 2 A pair of parallel undirected edges in a multigraph.
- 3 A pair of antiparallel edges in a directed graph.
Example
More examples"They [the students] also came upon new and unusual mathematical figures: the digon, a two-sided polygon on a spherical space, and the apeirogon, an open polygon with infinitely many sides […]. All these discoveries brought up even more questions. Is a circle a polygon? What makes an octagon an octagon – its eight vertices, its eight sides, or both? Can a polygon cross itself? Does a polygon need to be closed?"
Etymology
From di- (prefix meaning ‘two’) + -gon (suffix forming the names of plane figures containing a given number of angles).
Related phrases
More for "digon"
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.