different between penteract vs tesseract

English

penteract (plural penteracts)

From tessara- (“four-”) +? Ancient Greek ????? (aktís, “ray”).

tesseract (plural tesseracts)

(mathematics) The four-dimensional analogue of a cube; a 4D polytope bounded by eight cubes (in the same way a cube is bounded by six squares).
(science fiction) Any of various fictional mechanisms that explain extradimensional, superluminal, or time travel outside the geometry of the physical universe.

(analogue of a cube): four-dimensional hypercube, 4-cube, 8-cell, octachoron, tetracube

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