femto-
1.
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.
Origin
<
Danish,
Norwegian
femt
(
en
) fifteen +
-o-
British Dictionary definitions for
femto-
femto-
prefix
1.
denoting 10
–15
:
femtometer,
f
Word Origin
from Danish or Norwegian
femten
fifteen
femto-
in Medicine
femto-
pref.
One quadrillionth (10-
15
):
femtovolt.
femto-
in Technology
prefix