digon

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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

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

Derived terms

Translations

Further reading

Anagrams

Esperanto

Noun

digon

  1. accusative singular of digo

French

Pronunciation

Noun

digon m (plural digons)

  1. digon

Welsh

Etymology

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

Pronunciation

Noun

digon m (uncountable)

  1. enough, plenty, a sufficient amount

Derived terms

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
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