Word Pronunciation & Dictionary

octadecagon

Word Rarity Very rare

Frequency: Zipf frequency 0.00 in modern English

Syllables: oc-tadecagon
IPA

17

Scrabble Score

11

Letters

2

Syllables

8

Unique Chars

Meaning

noun

A polygon with 18 sides and 18 vertices.

Example Sentences

"A regular octadecagon cannot be constructed using a compass and straightedge."

Etymology

From octadeca- + -gon.

Word Breakdown

Prefix: octadeca
Suffix: gon

Inflected Forms

octadecagons (plural)

Synonyms

18-gon

Questions

What does octadecagon mean?: A polygon with 18 sides and 18 vertices.
Where does octadecagon come from?: From octadeca- + -gon.

How to pronounce octadecagon

Open the pronunciation page — Open the Speakur entry for “octadecagon”.
Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
Play the audio — Click Play to hear reference audio for “octadecagon”.
Repeat and practice — Say “octadecagon” aloud, matching stress and vowels until it feels natural.