tesseract; four-dimensional hypercube
A geometric figure in four-dimensional space; the 4D analogue of a cube. Used in mathematics and science fiction. The synonym 正八胞体 (regular octachoron) is also used in geometry.
See also: 正八胞体
A tesseract is a generalization of a cube in four-dimensional space.
In science fiction novels, tesseracts often appear.
Compound of 四次元 (four-dimensional) + 超 (super, hyper) + 立方体 (cube). A calque of English 'tesseract' or 'hypercube'.