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A dodecahedron is a polyhedron which has $12$ faces.

Regular Dodecahedron

A regular dodecahedron is a dodecahedron whose $12$ faces are all congruent regular pentagons.

Linguistic Note

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.