femtometre
/ˈfɛmtoʊˌmiːtər/
noun
- British spelling of 'femtometer'; a unit of length equal to one quadrillionth of a meter (10⁻¹⁵ meters).
- A femtometre is also called a fermi in nuclear physics.
- The nucleus of a carbon atom measures a few femtometres across.
- In British scientific journals, they often write 'femtometre' instead of 'femtometer'.
Synonyms