toponium

T1O1P3O1N1I1U1M3

noun

Any hypothetical meson formed from a top quark and its antiquark; would be very unstable because of the large mass of the top quark

OriginEnglish onium →
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Meanings

nountoponium (plural toponiums or toponia)

plural toponiums · plural toponia

  1. particlenatural sciencesAny hypothetical meson formed from a top quark and its antiquark; would be very unstable because of the large mass of the top quark

Origin

  1. Englishtop
  2. Englishonium
  3. Englishtoponium

From top + -onium. From top quark and "-onium" as in positronium.

Full word history & related roots →

Translations

French toponium
  • toponiumhypothetical meson
Russian топо́ний
  • топо́ний (topónij)hypothetical meson
Cite this entry
APA

toponium. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/toponium

MLA

“toponium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/toponium. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “toponium,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/toponium.

Source: toponium on Wiktionary, CC BY-SA 4.0.