fusor

plural fusors

1. historyA coin melter.

   There were proper officers in the exchequer for performing theſe operations, such as a peſour for weighing, and a fuſor for melting the coins that were to be tried; and theſe officers were furniſhed with proper inſtruments and conveniencies for their reſpective works.

   1789, The History of Great Britain, page 515

   2 more examples

   And that of my money, some is in real coin, that was paid by the tale; some to be valued ad scalum, as the Jews are most like to value it; others by increment,—you see I have the names and ways of increase and money matters at my tongue's end; others again must be taken ad pensum, and I may say that, take the whole, it would bear the trial of combustion; and that me and mine would make a fusor worthy the king's exchequer.

   1846, Novels and Romances, page 171

   No doubt some payments in the Exchequer were accepted by tale, according to custom or privilege, for Kelham records that there were proper officers for weighing, counting, or telling, assaying and laying up the money; a pesour, or weigher, a fusor, or melter, goldsmiths, and so forth.

   1887, Domesday Book, pages 280–281

2. astronomyA celestial body that, through self-gravity, is able to perform nuclear fusion within its core, at any point in its life. These include stars, stellar remnants, and brown dwarfs.
3. experimental physics; nuclear physics; experimental physics; nuclear physicsAn electrostatic inertial confinement fusion apparatus. A device that causes nuclear fusion through electrostatic field compression of the fusion fuel.