Definition of red mercury in English:

red mercury

noun

  • 1Chemistry= red precipitate. Now chiefly historical.

  • 2A powerful mercury-based substance rumoured to have been manufactured in Russia and elsewhere, and suggested as a potential ingredient of (especially terrorist) nuclear weapons.

Origin

Late 16th century. From red + mercury.

Pronunciation

red mercury

/rɛd ˈməːkjʊri/