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/ˌtɛtɹəˈhiːdɹən/ · noun
(geometry) A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids..
Use tetrahedron when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Tetrahedron means (geometry) A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use tetrahedron where its definition matches the intended context.
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