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WordReference Random House Unabridged Dictionary of American English © 2024hy•per•bo•loid (hī pûr′bə loid′),USA pronunciation n. [Math.]- a quadric surface having a finite center and some of its plane sections hyperbolas. Equation:.
- hyperbol(a) + -oid 1720–30
Collins Concise English Dictionary © HarperCollins Publishers:: hyperboloid /haɪˈpɜːbəˌlɔɪd/ n - a geometric surface consisting of one sheet, or of two sheets separated by a finite distance, whose sections parallel to the three coordinate planes are hyperbolas or ellipses. Equations x²/a² + y²/b² – z²/c² = 1 (one sheet) or x²/a² – y²/b² – z²/c² = 1 (two sheets) where a, b, and c are constants
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