icosahedral

adjective
ico·​sa·​he·​dral | \(ˌ)ī-ˌkō-sə-ˈhē-drəl, -ˌkä-\

Definition of icosahedral 

: of or having the form of an icosahedron

First Known Use of icosahedral

circa 1828, in the meaning defined above

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The first known use of icosahedral was circa 1828

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