See also: zeta, Zeta, zéta, zêta, żęta, and żętą English Proper noun ZETA (physics) Acronym of zero-energy thermonuclear assembly/apparatus (a torus-shaped reactor used in the mid-20th century to carry out experiments in plasma physics and temperature-controlled thermonuclear reactions) Anagrams zate Wikiwand - on Seamless Wikipedia browsing. On steroids.