tetrahedron
nounUK /ˌtetrəˈhiːdrən/
US /ˌtetrəˈhiːdrən/
A tetrahedron is a solid shape with four flat triangle faces.
The dice in the game was shaped like a tetrahedron.
RELATED WORDS
OTHER MEANINGS
2. In geometry, a simplex in three-dimensional space with four vertices and six edges.
The mathematician proved the theorem using a regular tetrahedron.
3. A four-faced figure used as a symbol in some games and puzzles.
Each player rolled a tetrahedron to decide how many spaces to move.
4. A crystal form in mineralogy having four triangular faces.
The mineral sample showed a perfect tetrahedron under the microscope.