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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
femtometer
1.
femtometer
(quantity)
a metric unit of length equal to one quadrillionth of a meter
Synonyms
femtometre
,
fermi
Broader (hypernym)
metric linear unit
Part meronym
micromicron
,
picometer
,
picometre
Based on WordNet 3.0 copyright © Princeton University.
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