Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun physics A unit of
area equal to a billionth of a millionth (1015) of abarn
Etymologies
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Examples

In these years, the Tevatron marched on, reaching its first inverse femtobarn by mid 2005, then setting new records almost routinely in the following years.

An inverse femtobarn at the LHC pushes the discovery range up to
NZ On Screen 2010

With the amount of data expected, called one inverse femtobarn by physicists, the combined analysis of ATLAS and CMS will be able to explore a wide mass range, and there's even a chance of discovery if the Higgs has a mass near 160 GeV.
Muti 2010

Well, they have to improve the luminosity by a factor of 1,000 to collect one inverse femtobarn by the end of 2011.
The Reference Frame 2010

An inverse femtobarn at the LHC pushes the discovery range up to 800 GeV.
Muti 2010

It will work to accumulate one inverse femtobarn of collisions and stop, but not later than at the end of 2011.
The Reference Frame 2010

(Recall that they will stop the collider at the end of 2011 or when they reach 1/femtobarn, whatever comes first.)
The Reference Frame 2010

With the amount of data expected, called one inverse femtobarn by physicists, the combined analysis of ATLAS and CMS will be able to explore a wide mass range, and there's even a chance of discovery if the Higgs has a mass near 160 GeV.
NZ On Screen 2010

If they increase the luninosity by a factor of 30, they will reach 1/femtobarn per year  which is enough to fulfill the realistic plan of 1/femtobarn before the end of 2011.
The Reference Frame 2010

With the amount of data expected, referred to as one inverse femtobarn, the experiments should be well placed to make inroads in to new territory, with the possibility of significant discoveries.
YubaNet.com 2010
qms commented on the word femtobarn
The boffins with patient precision
Examine each tiny collision
And don't give a darn 
Not one femtobarn 
For ignorant cries of derision.
October 14, 2016