English
Etymology
From octadeca- + -gon.
Pronunciation
Noun
octadecagon (plural octadecagons)
- (geometry, rare) A polygon with 18 sides and 18 vertices.
A regular octadecagon cannot be constructed using a compass and straightedge.
Synonyms
Translations
geometry
- Belarusian: васемнаццацікутнік m (vasjemnaccacikutnik)
- Bulgarian: осемнадесетоъгълник m (osemnadesetoǎgǎlnik)
- Catalan: octodecàgon m
- Chinese:
- Mandarin: 十八邊形 / 十八边形 (zh) (shíbā biānxíng)
- Czech: osmnáctiúhelník (cs) m
- Dutch: achttienhoek (nl) m
- Esperanto: dekoklatero
- Finnish: 18-kulmio (kahdeksantoistakulmio)
- French: octadécagone (fr) m
- Galician: octodecágono (gl) m
- Georgian: თვრამეტკუთხედი (tvrameṭḳutxedi)
- German: Achtzehneck (de) n
- Greek: δεκαοκτάγωνο n (dekaoktágono)
- Hungarian: tizennyolcszög
- Italian: ottadecagono (it) m
- Japanese: 十八角形 (jūhachikakukei)
- Korean: 십팔각형 (sip'palgakhyeong)
- Low German:
- East Frisian: achttainkâant (nds) m
- Macedonian: осумнаесетаголник m (osumnaesetagolnik)
- Polish: osiemnastokąt m
- Portuguese: octodecágono (pt) m
- Romanian: octodecagon n
- Russian: восемнадцатиугольник (ru) m (vosemnadcatiugolʹnik)
- Serbo-Croatian:
- Cyrillic: осамнаестоугао m
- Roman: osamnaestougao m
- Slovene: osemnajstkotnik m
- Spanish: octodecágono (es) m
- Swedish: oktadekagon m
- Thai: รูปสิบแปดเหลี่ยม m
- Turkish: onsekizgen m
- Ukrainian: вісімнадцятикутник (visimnadcjatykutnyk)
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