Femtojoule

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
An SI unit of energy, work, and heat equal to 10⁻¹⁵ joules. Symbol: fJ

Synonyms

Etymology

From femto- + joule.

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