tokamak

The story

1. Russian · borrowed fromтокама́к
2. English todaytokamak

Borrowed from Russian токама́к (tokamák), an acronym of то(роида́льная) ка́(мера) (с) ма(гни́тными) к(ату́шками) (to(roidálʹnaja) ká(mera) (s) ma(gnítnymi) k(atúškami), “toroidal chamber with magnetic coils”).

First known use, by meaning

• from 20th c. A torus-shaped chamber used in nuclear fusion research in which plasma is magnetically confined.