First Known Use: 1570
Dictionary
icosahedron
noun ico·sa·he·dron \-drən\
plural ico·sa·he·drons or ico·sa·he·dra\-drə\
Definition of ICOSAHEDRON
: a polyhedron having 20 faces
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Origin of ICOSAHEDRON
Greek eikosaedron, from eikosi twenty + -edron -hedron — more at vigesimal
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