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icosahedron

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌaɪkəsəˈhiːdrən/US:USA pronunciation: respellingUSA pronunciation: respelling(ī kō′sə hē′drən, ī kos′ə-)

i•co•sa•he•dron (ī kō′sə hē′drən, ī kos′ə-),USA pronunciation n., pl. -drons, -dra (-drə).USA pronunciation

Mathematicsa solid figure having 20 faces.

Greek eikosáedron, equivalent. to eikosa- (variant of eikosi-, combining form of eíkosi twenty) + -edron -hedron
1560–70

i•co′sa•he′dral, adj.

Collins Concise English Dictionary © HarperCollins Publishers::

icosahedron /ˌaɪkəsəˈhiːdrən/ n ( pl -drons, -dra /-drə/)

a solid figure having 20 faces. The faces of a regular icosahedron are equilateral triangles

Etymology: 16th Century: from Greek eikosaedron, from eikosi twenty + -edron -hedronˌicosaˈhedral adj

'icosahedron' also found in these entries (note: many are not synonyms or translations):

Platonic solid - polyhedron - geodesic dome

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icosahedron