icosahedron
Concise Oxford English Dictionary © 2008 Oxford University Press:
icosahedron /ˌʌɪkɒsəˈhiːdrən, -ˈhɛd-/
▶noun (pl. icosahedra or icosahedrons) a three-dimensional shape having twenty plane faces, in particular a regular solid figure with twenty equal triangular faces.
– derivatives
icosahedral adjective.
icosahedral adjective.
– origin C16: via late L. from Gk eikosaedron, neut. (used as n.) of eikosaedros ‘twenty-faced’.
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