doughnut-shaped
5.The effect of SnO_2 dosing on performance of SrTiO-3 doughnut-shaped varistor is presented.
6.A memory, especially one consisting of a series of tiny doughnut-shaped masses of magnetic material.
7.A doughnut-shaped chamber used in fusion research in which a plasma is heated and confined by magnetic fields.
8.set of magnets set in a doughnut-shaped ring around which charged particles from an accelerator can be kept circulating until they are used.
9.That technique uses a magnetic field to hold large volumes of the same isotopes of hydrogen inside a doughnut-shaped vessel, called a tokamak.

