WordReference Random House Unabridged Dictionary of American English © 2026
hy•per•sphere
(hī′pər sfēr′, hī′pər sfēr′),USA pronunciation n. [Math.]
hy•per•spher•i•cal
(hī′pər sfer′i kəl),USA pronunciation adj.
- Mathematicsthe generalization of a sphere to more than three dimensions.
- 1965–70; hyper- + sphere