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A dodecahedron is a polyhedron which has $12$ faces.
A regular dodecahedron is a dodecahedron whose $12$ faces are all congruent regular pentagons.
The word dodecahedron derives from the Classical Greek δωδεκάεδρόν:
- dodeca (δωδεκά), meaning twelve
- hedron (a form of ἕδρα), meaning base or seat.
The technically correct plural of dodecahedron is dodecahedra, but the word dodecahedrons can often be found.
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): dodecahedron
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): dodecahedron (dodecahedra)