Definition

1. Noun:
   • A solid geometric figure with twelve plane faces: A dodecahedron is any polyhedron (a three-dimensional shape with flat polygonal faces, straight edges, and sharp corners or vertices) that has exactly twelve faces. Each face is a polygon.

Usage Examples

• Noun:
  • A regular dodecahedron is one of the five Platonic solids.
  • The artist created a sculpture in the shape of a complex, irregular dodecahedron.
  • In geometry class, we learned to calculate the volume of a dodecahedron.

Advanced Usage

• "Regular dodecahedron": A specific type of dodecahedron where all twelve faces are congruent regular pentagons. It is a highly symmetrical, convex polyhedron.
  • The regular dodecahedron has been a subject of mathematical interest since ancient times.

Variants and Related Words

• Dodecahedral (adj): Having the form of a dodecahedron.
  • The crystal had a dodecahedral structure.

Synonyms

• Twelve-faced polyhedron: A more descriptive synonym.
• Platonic solid (when referring specifically to the regular dodecahedron): One of the five convex regular polyhedra.

Related Phrases

(This word is a specific geometric term and does not commonly form phrasal verbs or idioms in general English usage.)

Noun

1. any polyhedron having twelve plane faces