do·​deca·​he·​dron (ˌ)dō-ˌde-kə-ˈhē-drən How to pronounce dodecahedron (audio)
plural dodecahedrons or dodecahedra (ˌ)dō-ˌde-kə-ˈhē-drə How to pronounce dodecahedron (audio)
: a solid having 12 plane faces
dodecahedral adjective

Example Sentences

Recent Examples on the Web The stars are projected accurately on the ceiling by a single lightbulb shining through pinholes in a black, metal dodecahedron. Dean Regas, The Enquirer, 25 Feb. 2023 Experts believe the piece belonged to a dodecahedron that measured roughly two inches across. Sarah Kuta, Smithsonian Magazine, 6 Feb. 2023 Among the artifacts recovered is a rare Roman dodecahedron, or hollow copper object possibly used as a weapon or measuring device, as scholar Michael Guggenberger wrote in a 2013 Mathematical Intelligencer article. Isis Davis-marks, Smithsonian Magazine, 18 Dec. 2020 Now Jayadev Athreya, David Aulicino and Patrick Hooper have shown that an infinite number of such paths do in fact exist on the dodecahedron. Quanta Magazine, 31 Aug. 2020 Now, a trio of mathematicians has resolved one of the most basic questions about the dodecahedron. Quanta Magazine, 31 Aug. 2020 The dodecahedron symbolized all the heavenly bodies — the stars and planets, each perfect in shape and movement. Quanta Magazine, 16 June 2020 Here, the walls are decorated simply with some abstract decals, and bare light bulbs caged in metal dodecahedrons hang from the ceiling. San Francisco Chronicle, 29 Nov. 2019 This show was originally installed at Oakville Galleries, in Oakville, Ontario, on the outer walls of a dodecahedron, a 12-sided structure. Cate Mcquaid,, 30 May 2018 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'dodecahedron.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Greek dōdekaedron, from dōdeka- + -edron -hedron

First Known Use

circa 1570, in the meaning defined above

Time Traveler
The first known use of dodecahedron was circa 1570

Dictionary Entries Near dodecahedron

Cite this Entry

“Dodecahedron.” Dictionary, Merriam-Webster, Accessed 31 Mar. 2023.

Kids Definition


do·​deca·​he·​dron (ˌ)dō-ˌdek-ə-ˈhē-drən How to pronounce dodecahedron (audio)
plural dodecahedrons or dodecahedra -drə How to pronounce dodecahedron (audio)
: a polyhedron that has 12 faces

More from Merriam-Webster on dodecahedron

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