truncated tetrahedron
(geometry) A convex polyhedron, with four triangular and four hexagonal faces, that is an Archimedean solid and can be constructed by truncating a regular tetrahedron at each vertex by one-third the length of each adjoining edge.
In diesel engines, a repetitive knocking sound when delayed ignition causes sudden high pressures.
(slang) The penis of a young man.
(zoology) Relating to the Sipunculidea.
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