Femtobarn

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A unit of area equal to a billionth of a millionth (10⁻¹⁵) of a barn

Etymology

From femto- + barn.

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