decahedron

noun

deca·he·dron ˌde-kə-ˈhē-drən

plural decahedrons or decahedra ˌde-kə-ˈhē-drə

: a polyhedron of 10 faces

Word History

Etymology

International Scientific Vocabulary

First Known Use

circa 1828, in the meaning defined above

Time Traveler

The first known use of decahedron was circa 1828

See more words from the same year

Browse Nearby Words

decahedral

decahedron

decahydrate

See all Nearby Words

Cite this Entry

Style

“Decahedron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/decahedron. Accessed 3 Nov. 2025.

Copy Citation

More from Merriam-Webster

Word of the Day

fidelity

Listen to the pronunciation of fidelity

See Definitions and Examples »

Get Word of the Day daily email!

Popular in Grammar & Usage

'Affect' vs. 'Effect'

Using Bullet Points ( • )

The Difference Between 'i.e.' and 'e.g.'

What’s the difference between ‘cemetery’ and ‘graveyard’?

Democracy or Republic: What's the difference?

Popular in Wordplay

Skibidi, Mog & More: Gen Alpha Slang

13 Wonderful Words That You're Not Using (Yet)

Ten More Words from Taylor Swift Songs

Birds Say the Darndest Things

Even More Bird Names that Sound Like Insults (and Sometimes Are)

Popular

'Affect' vs. 'Effect'

Skibidi, Mog & More: Gen Alpha Slang

13 Wonderful Words That You're Not Using (Yet)