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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]
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Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
BARNBilateral 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.