digon

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English[edit]

Etymology[edit]

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[edit]

Noun[edit]

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[edit]

Derived terms[edit]

Translations[edit]

Further reading[edit]

Anagrams[edit]


Esperanto[edit]

Noun[edit]

digon

  1. accusative singular of digo

Welsh[edit]

Etymology[edit]

Deverbal from digoni (to be able, to suffice), from a Proto-Celtic *dīkān-: *dī- (from, of) + possibly the root *kān- (sound) that also appears in gwogawn (glory), gogoniant (splendour).[1]

Pronunciation[edit]

Noun[edit]

digon m (uncountable)

  1. enough, plenty, a sufficient amount

Derived terms[edit]

Adverb[edit]

digon

  1. enough, sufficient

Mutation[edit]

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[edit]

  1. ^ 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