a combining form used in the names of units of measurement which are 10 -15 (one quadrillionth) smaller than the unit denoted by the base word.
[ femt ( en ) fifteen + -O- ]
a combining form used in the names of units of measurement which are 10 -15 (one quadrillionth) smaller than the unit denoted by the base word.
[ femt ( en ) fifteen + -O- ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012