Standard Lemma guide

icosahedron

noun · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • /(ˌ)aɪˌkoʊsəˈhiːdɹən/
  • /(ˌ)aɪˌkɒsəˈhiːdɹən/
  • /(ˌ)aɪˌkɔsəˈhiːdɹən/
  • General-American: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

A polyhedron with twenty faces.

Definition source: English Wiktionary via Wiktextract

Topics: geometry, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A regular icosahedron: one of the Platonic solids, all of whose faces are regular (equilateral) triangles

Definition source: English Wiktionary via Wiktextract

Usage: specifically

Topics: geometry, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: regular gyroelongated pentagonal bipyramid

Antonyms: none provided

3

noun

Meaning 3

any polyhedron having twenty plane faces

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: polyhedron

History

Etymology

From Ancient Greek εἰκοσάεδρον (eikosáedron), from εἴκοσι (eíkosi, “twenty”) + ἕδρα (hédra, “face of a geometrical solid”). Equivalent to icosa- + -hedron.

Across languages

Translations

33 source translations are retained for this English entry.

  • Catalan: icosaedre — a polyhedron
  • Catalan: icosàedre — a polyhedron
  • Czech: dvacetistěn — a polyhedron
  • Czech: ikosaedr — a polyhedron
  • Danish: ikosaeder — a polyhedron
  • Dutch: twintigvlak — a polyhedron
  • Dutch: icosaëder — a polyhedron
  • Esperanto: dudekedro — a polyhedron
  • Estonian: ikosaeeder — a polyhedron
  • Estonian: kakskümmendtahukas — a polyhedron
  • Finnish: ikosaedri — a polyhedron
  • French: icosaèdre — a polyhedron
  • German: Ikosaeder — a polyhedron
  • German: Zwanzigflächner — a polyhedron
  • German: 20-Flächner — a polyhedron
  • Greek: εικοσάεδρο (eikosáedro) — a polyhedron
  • Ancient Greek: εἰκοσάεδρον (eikosáedron) — a polyhedron
  • Hungarian: ikozaéder — a polyhedron
  • Icelandic: tuttuguflötungur — a polyhedron
  • Ido: ikosaedro — a polyhedron
  • Japanese: 二十面体 (nijūmentai) — a polyhedron
  • Korean: 이십면체 (isimmyeonche) — a polyhedron
  • Norwegian Bokmål: ikosaeder — a polyhedron
  • Polish: dwudziestościan foremny — a polyhedron
  • Portuguese: icosaedro — a polyhedron
  • Russian: икоса́эдр (ikosáedr) — a polyhedron
  • Russian: двадцатигра́нник (dvadcatigránnik) — a polyhedron
  • Spanish: icosaedro — a polyhedron
  • Swedish: ikosaeder — a polyhedron
  • Vietnamese: nhị thập diện — a polyhedron
  • Czech: pravidelný dvacetistěn — regular icosahedron
  • Japanese: 正二十面体 (seinijūmentai) — regular icosahedron
  • Korean: 정이십면체 (jeong'isimmyeonche) — regular icosahedron
Real reading context

icosahedron in complete knowledge articles