femtometer

listen to the pronunciation of femtometer
الإنجليزية - الإنجليزية
US spelling of femtometre: A length of 10-15 of a meter, 1 quadrillionth of a meter
a metric unit of length equal to one quadrillionth of a meter
A length of 10[-15] of a meter, 1 quadrillionth of a meter
{i} (Physics) metric unit of length for measuring nuclear distances (also fermi)