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femtometer

[fem-tuh-mee-ter]

fem·to·me·ter

[fem-tuh-mee-ter]
noun Physics.
fermi. Symbol: fm

Origin:
1970–75; femto- + meter1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To femtometer

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Femtometer is always a great word to know.
So is excited state. Does it mean:
the ability of a substance to flow; a measure of this ability, the reciprocal of the coefficient of viscosity
any of the energy levels of a physical system, such as an atom or molecule, that has higher energy than the lowest energy level
WordNet
femtometer

noun
a metric unit of length equal to one quadrillionth of a meter 
WordNet® 3.0, © 2006 by Princeton University.
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