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icosahedron
i·co·sa·he·dron [ ī kssə hdrən ] (plural i·co·sa·he·drons or i·co·sa·he·dra [ ī kssə hdrə ])


noun 
Definition:
 
20-sided figure: a three-dimensional geometric figure formed of 20 sides or faces
[Late 16th century. Via late Latin< Greek eikosaedron< eikosi "twenty" + hedra "base"]

i·co·sa·he·dral adjective
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