digon

A digon with an internal area (the green portion) can be depicted on the surface of a sphere if its vertices are antipodal (on opposide sides of the sphere). On a flat surface, a digon would look like a line.

From di- (prefix meaning ‘two’) +‎ -gon (suffix forming the names of plane figures containing a given number of angles).

• (Received Pronunciation) IPA^(key): /ˈdaɪɡən/, /ˈdaɪˌɡɒn/

• Audio (Southern England)

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• (General American) IPA^(key): /ˈdaɪɡən/, /ˈdaɪˌɡɑn/
• Hyphenation: di‧gon

digon (plural digons)

1. (geometry) A polygon having two edges and two vertices.

   Synonyms: biangle, bigon, (less common) diangle

   • 2013, Brent Davis, Moshe Renert, chapter 6, in The Math Teachers Know: Profound Understanding of Emergent Mathematics, New York, N.Y., Abingdon, Oxfordshire: Routledge, →ISBN, page 102:

     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. (graph theory)
   1. A pair of parallel undirected edges in a multigraph.
   2. A pair of antiparallel edges in a directed graph.

• monogon · digon (biangle · bigon) · trigon (triangle) · tetragon (quadrilateral) · pentagon · hexagon · heptagon (septagon) · octagon · nonagon (enneagon) · decagon · undecagon · dodecagon · see also Category:English terms suffixed with -gon

• digonal

• digon on Wikipedia.Wikipedia

• Gondi, doing, doïng, Godin, ODing, Diong, OD'ing, dingo

digon

1. accusative singular of digo

• Audio

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digon m (plural digons)

1. digon

Deverbal from digoni (“to be able, to suffice”).

• (North Wales) IPA^(key): /ˈdɪɡɔn/
• (South Wales) IPA^(key): /ˈdiːɡɔn/, /ˈdɪɡɔn/

digon m (uncountable)

1. enough, plenty, a sufficient amount

• digonol (“adequate”)

digon

1. enough, sufficient

• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “digon”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies