noun
octadecagon
Octadecagon (noun) means an octadecagon is a polygon with eighteen sides and eighteen corners. Example: “The students were asked to draw an octadecagon with equal sides.”
noun
1
rare An octadecagon is a polygon with eighteen sides and eighteen corners.
"The students were asked to draw an octadecagon with equal sides."
"A regular octadecagon has eighteen equal angles."
"Few everyday objects are shaped like an octadecagon."
How to use octadecagon
Learner’s notesIn plain EnglishAn octadecagon is simply a shape with eighteen straight sides.
When to use it
This is a rare, technical geometry term.
Memory tip
Don't confuse it with octagon: octadeca- means eighteen, not eight.
Trace the full origin ↓
Easily confused with
Common pairings
regular octadecagon
draw an octadecagon
Vocabulary Flow
Build your vocabulary from words like octadecagon.
Vocabulary Flow serves the next word, and the next — meaning, pronunciation and an example each time. Practice at your level, or learn English in your own language.
Start vocabulary practice
Fill the gap
Can you complete this real example?
The students were asked to draw an _____ with equal sides.
Etymology
Octadecagon is formed from octadeca-, meaning eighteen, and the suffix -gon, used for shapes with a set number of sides.
Synonyms
View more →
18-gon
Rhymes for octadecagon
See all rhymes for octadecagon →Frequently asked questions
What is an octadecagon?
It is a polygon with eighteen sides and eighteen vertices.
How many sides does an octadecagon have?
An octadecagon has eighteen sides.
Is octadecagon a common shape name?
It is a rare, technical term mostly used in geometry.
What is the meaning of octadecagon?
"octadecagon" (noun) means an octadecagon is a polygon with eighteen sides and eighteen corners.
