Definition of "hyperboloid" []

• Either of two quadric surfaces generated by rotating a hyperbola about either of its main axes and having a finite center with certain plane sections that are hyperbolas and others that are ellipses or circles. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It has 4 nester hyperboloid mirrors and 4 nested paraboloid mirrors to focus the x-rays."
• "Figure 3 by taking Σ to be the indicated spacelike hyperboloid of (1 + 1) - dimensional Minkowski spacetime."
• "The big milling machine was working on the final large beryllium component, a large metallic hyperboloid about fifty centimeters in length, with a maximum width of twenty."