digon

English

WOTD – 11 February 2022

Etymology

PIE word *dwóh₁

PIE word *ǵónu

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).

Pronunciation

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

• Audio (Southern England)

  (file)

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

Noun

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.

Coordinate terms

• 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

Derived terms

• digonal

Translations

polygon having two edges and two vertices

• Basque: digono
• Belarusian: двухвугольнік (dvuxvuhólʹnik)
• Bengali: দ্বিভুজ (bn) (dibhuj)
• Chinese:

  Mandarin: 二角形 (èrjiǎoxíng)

• Dutch: tweehoek (nl) m
• Esperanto: dulatero
• Finnish: kaksikulmio
• French: digone (fr) m
• German: Kugelzweieck n, sphärisches Zweieck n, Zweieck n, Kugelzweiseit m, Zwickel (de) m
• Hindi: डाइगोन (ḍāigon)
• Hungarian: kétszög
• Icelandic: tvíhyrningur m
• Interlingua: fuso
• Japanese: 二角形 (にかくかた, nikakukata)
• Korean: 이각형 (igakhyeong)
• Kurdish:

  Central Kurdish: دوولا (dûla)

• Lao: ຮູບສອງແຈ (hūp sǭng chǣ)
• Macedonian: двоаголник m (dvoagolnik)
• Norwegian:

  Bokmål: sfærisk tokant

• Polish: dwukąt m
• Russian: двуугольник (ru) m (dvuugolʹnik)
• Slovene: dvókótnik
• Spanish: dígono m
• Thai: รูปสองเหลี่ยม
• Ukrainian: дигон (dyhon), двокутник (dvokutnyk)

pair of parallel undirected edges in a multigraph

pair of antiparallel edges in a directed graph

Further reading

• digon on Wikipedia.Wikipedia

Anagrams

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

Esperanto

Noun

digon

1. accusative singular of digo

French

Pronunciation

• Audio

  (file)

Noun

digon m (plural digons)

1. digon

Welsh

Etymology

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

Pronunciation

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

Noun

digon m (uncountable)

1. enough, plenty, a sufficient amount

Derived terms

• digonol (“adequate”)

Adverb

digon

1. enough, sufficient

Mutation

Welsh mutation
radical	soft	nasal	aspirate
digon	ddigon	nigon	unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

References

• 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