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Linguistic Note on Icosahedron
The word icosahedron derives from the Classical Greek εἰκοσάεδρον:
- eíkosi (εἴκοσι), meaning twenty
- hedron (a form of ἕδρα), meaning base or seat.
The technically correct plural of icosahedron is icosahedra, but the word icosahedrons can often be found.