Search Result for "femtometer": 
Wordnet 3.0

NOUN (1)

1. a metric unit of length equal to one quadrillionth of a meter;
[syn: femtometer, femtometre, fermi]



WordNet (r) 3.0 (2006):

femtometer
    n 1: a metric unit of length equal to one quadrillionth of a
         meter [syn: femtometer, femtometre, fermi]