IPA: /aɪˈkoʊsəˌhɛdrəl/
KK: /aɪˈkoʊsəˌhɛdrəl/
Relating to or having the shape of a solid figure with twenty faces, known as an icosahedron.
The artist created a sculpture that was icosahedral in shape, with twenty triangular faces.
Icosahedral → It is formed from "icosa-" (from Greek "eikosi", meaning twenty) and "hedra" (from Greek "hedra", meaning face or base). The word describes a three-dimensional shape with twenty faces.
Imagine a shape with 'twenty' ('icosa-') 'faces' ('hedra') — that's what an icosahedral shape is.