supergrade

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adjective

Of plutonium: containing a very small portion of isotopes other than plutonium-239 (especially plutonium-240) (less than perhaps 3%), making the plutonium especially suitable for nuclear weapons

Scrabble 14
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Meanings

adjectivesupergrade (not comparable)
  1. not comparableOf plutonium: containing a very small portion of isotopes other than plutonium-239 (especially plutonium-240) (less than perhaps 3%), making the plutonium especially suitable for nuclear weapons

Origin

From super- + grade.

Full word history & related roots →
Cite this entry
APA

supergrade. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/supergrade

MLA

“supergrade.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/supergrade. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “supergrade,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/supergrade.

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