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barn (b),

A unit of area for effective cross-section of atomic nuclei with respect to atomic projectiles; equal to 10-24 cm2.
[fr. "big as the side of a barn" by humorous comparison with much smaller areas]
Farlex Partner Medical Dictionary © Farlex 2012
A unit of area—10–24 cm2—for the effective cross-section of atomic nuclei; barns indicate the cross-sectional area in which atomic, nuclear, and particle interactions occur
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


Bilateral acute retinal necrosis Ophthalmology A condition characterized by herpes virus-induced anterior and posterior uveitis, papillitis with retinal detachment 1-3 months after onset, of which only 50% are bilateral. See Herpes.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
References in classic literature ?
They ran to the barn and then back again, re-entering, he by the front and she by the back porch.
The old barn leaked like a sieve, but they managed to find a dry space on which to spread their anything but dry bedding.
From the open doorway came a flash of electric light, like a tiny searchlight, which quested about the barn and came to rest on her and Billy.
The people then assembled in this barn were no other than a company of Egyptians, or, as they are vulgarly called, gypsies, and they were now celebrating the wedding of one of their society.
Greater plenty, likewise, was nowhere to be seen than what flourished in this barn. Here was indeed no nicety nor elegance, nor did the keen appetite of the guests require any.
What would you say if I was to prove to you that it would build a fine chicken-house, one for the herd boar, a concrete tank down in the pasture that'd save the cows enough trips to the barn to make 'em give a heap sight more milk, a cooling house for it and a good tool room?" Rose's eyes opened wide.
The running water and bath in the house were given up for piping to the barn, and stanchions--then novelties in southeastern Kansas.
However, she was so overcome that she consented to lie down awhile, and reclined on a heap of pull-tails--the refuse after the straight straw had been drawn--thrown up at the further side of the barn. Her succumbing had been as largely owning to agitation at the re-opening the subject of her separation from her husband as to the hard work.
The dim light in the barn grew dimmer, and they could see to work no longer.
He pulled on his wet coat again and went back to the barn to feed the greys.
He had a long sleep in the barn and then a big breakfast of coffee and bread and oatmeal and stewed cherries, for which the man charged him only fifteen cents, perhaps having been influenced by his arguments.
They hang up the rats' tails in a row or the barn door, to show how many they have caught--dozens and dozens of them.