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spherator
1. One of the class of low-β, low-density, quasi-steady-state closed devices (like Tokamak) used in studying production of electric power by fusion.

A Tokamak is an experimental doughnut-shaped nuclear reactor for producing fusion using an electric current and a magnetic field to heat and to contain a gaseous plasma.

2. Etymology of Tokamak is from the mid-20th century from the Russian, contraction of toroidal'naya kamera s aksial'nym magnitnym polem, "toroidal chamber with axial magnetic field".
This entry is located in the following units: -or; -our (primarily British) (page 13) sphero-, spher-, -sphere- (page 11)