Meanings
Synonyms & antonyms
nounThe hypothetical chemical element with atomic number 137.
Origin
From Feynman + -ium. After Richard Feynman, who used a back-of-the-envelope calculation using classical physics to determine that element 137 is the last stably neutrally charged element, as larger elements would need electrons traveling faster than light to become neutral. (This problem goes away when relativity is considered.)
Full word history & related roots →Cite this entry
feynmanium. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/feynmanium
“feynmanium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/feynmanium. Accessed November 3, 2026.
WatkinsX Dictionary, s.v. “feynmanium,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/feynmanium.
Source: feynmanium on Wiktionary, CC BY-SA 4.0.