regular icosahedron
- noun
- /ˈrɛɡjələr aɪˈkoʊsəˌhɛdrən/
- Specialized
:
icosaedro regular
- A regular icosahedron has twenty equilateral triangle faces, making it one of the simplest and most symmetrical geometric shapes.
- a truncated regular icosahedron
Examples
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The artist designed a model of a regular icosahedron for her sculpture, using bright colors on each triangular face.
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In geometry class, we learned that a regular icosahedron can be constructed by connecting points on a sphere.
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Nothing else fits the bill as well as a truncated regular icosahedron.
Academic text (1996) -
All the 60 vertices of a truncated regular icosahedron are identical; each one is the junction of two hexagons and a pentagon.
Academic text (1996) -
PHOTO (COLOR): A SOCCER BALL, like a C60 molecule, is essentially a truncated regular icosahedron, with 20 hexagons and 12 pentagons.
Academic text (1996)
How Many
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Surface Forms
Morphology
The phrase is a straightforward adjective + noun composition: 'icosahedron' names a 3D shape with twenty triangular faces and 'regular' specifies symmetry and equal (identical, equilateral) faces. This compositional relation is predictable and follows normal English modifier patterns, so a learner who knows both constituents can derive the MWE meaning.
Etymology
Regular icosahedron names a 3D shape made of twenty equal 'faces' that are triangles, where regular means every part is the same and icosahedron points to the twenty sides. Imagine a ball built from twenty identical triangle panels, and that image explains why the term means a solid with twenty identical triangle faces.
