Fissionable

adj, noun

adj, noun ·4 syllables ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Any fissile or fissionable substance.

    "If one nation seized the fissionables within its borders, this would “serve as a danger signal” to other nations. The wrongdoer's gain would be short-lived because other nations would take defensive action in kind."

Adjective
  1. 1
    Capable of undergoing nuclear fission; fissile.
Adjective
  1. 1
    capable of undergoing nuclear fission wordnet

Synonyms

All synonyms
fissilefissilescissile

Example

More examples

"If one nation seized the fissionables within its borders, this would “serve as a danger signal” to other nations. The wrongdoer's gain would be short-lived because other nations would take defensive action in kind."

Etymology

From fission + -able.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.