pentadecagon

P3E1N1T1A1D2E1C3A1G2O1N1
/ˌpɛntəˈdɛkəɡən/

noun

A polygon with fifteen sides.

Similar
15-gonquindecagon
Scrabble 18
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Meanings

nounpentadecagon (plural pentadecagons)

plural pentadecagons

  1. geometryA polygon with fifteen sides.

    In ⊙ O, draw chord AB equal to r. Draw chord AC equal to Vt (which is the side of a regular decagon). CB is now one side of the regular pentadecagon.

    2003, Steven Atiyah, Essentials of Geometry, Trafford, published 2003, page 357

    Synonyms: 15-gon, quindecagon

Synonyms & antonyms

nounA polygon with fifteen sides.

Similar
15-gonquindecagon
Also see
15-gonquindecagon

Origin

From pentadeca- + -gon.

Full word history & related roots →

Translations

Bulgarian петнадесетоъгълник
  • петнадесетоъгълник (petnadesetoăgălnik)15-sided polygon
Catalan pentadecàgon
  • pentadecàgon15-sided polygon
Chinese Mandarin 十五邊形 /十五边形
  • 十五邊形 /十五边形 (shíwǔ biānxíng)15-sided polygon
Czech patnáctiúhelník
  • patnáctiúhelník15-sided polygon
Dutch vijftienhoek
  • vijftienhoek15-sided polygon
Esperanto dekkvinlatero
  • dekkvinlatero15-sided polygon
Finnish viisitoistakulmio
  • viisitoistakulmio15-sided polygon
French pentadécagone, pentédécagone
  • pentadécagone15-sided polygon
  • pentédécagone15-sided polygon
German Fünfzehneck
  • Fünfzehneck15-sided polygon
Greek δεκαπεντάγωνο
  • δεκαπεντάγωνο (dekapentágono)15-sided polygon
Hungarian tizenötszög
  • tizenötszög15-sided polygon
Italian pentadecagono
  • pentadecagono15-sided polygon
Japanese 十五角形
  • 十五角形 (jūgokakukei)15-sided polygon
Korean 십오각형
  • 십오각형 (sibogakhyeong)15-sided polygon
Polish piętnastokąt
  • piętnastokąt15-sided polygon
Portuguese pentadecágono
  • pentadecágono15-sided polygon
Romanian pentadecagon
  • pentadecagon15-sided polygon
Russian пятнадцатиугольник
  • пятнадцатиугольник (pjatnadcatiugolʹnik)15-sided polygon
Spanish pentadecágono
  • pentadecágono15-sided polygon
Swedish pentadekagon
  • pentadekagon15-sided polygon
Thai รูปสิบห้าเหลี่ยม
  • รูปสิบห้าเหลี่ยม15-sided polygon
Turkish ondörtgen
  • ondörtgen15-sided polygon
Ukrainian п'ятнадцятикутник
  • п'ятнадцятикутник (pʺjatnadcjatykutnyk)15-sided polygon
Cite this entry
APA

pentadecagon. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/pentadecagon

MLA

“pentadecagon.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pentadecagon. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “pentadecagon,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/pentadecagon.

Source: pentadecagon on Wiktionary, CC BY-SA 4.0.