icosahedron

1. 1.

   any polyhedron having twenty plane faces

   Broaderpolyhedron

Other forms of icosahedron

plural

icosahedra

Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.

Questions about icosahedron

What does icosahedron mean?

icosahedron means "any polyhedron having twenty plane faces".

How many syllables are in icosahedron?

icosahedron has 5 syllables: i-co-sa-he-dron. The stress falls on "sa".

Is icosahedron a common word?

icosahedron is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.