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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]
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


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.


a building usually intended to house animals for long periods during the winter season. Marked by an infinite variety of designs and internal fittings, they usually contain a feed storage area, often as a haymow or loft in a top storey, and animal stalls and handling facilities such as a milking parlor on the ground floor.

free stall barn
cattle are free to enter unoccupied stalls.
barn itch
barn rat
a horse that shows eagerness or determination to return to the stable. See also agoraphobia.
barn sheet
a sketchy method of recording events, especially reproductive ones, in the lives of the inmates of the barn. Fixed to the barn wall it does provide an opportunity to record events as they happen, but suffers the obvious disadvantage of exposure to disfiguring and obscuring materials, especially fly droppings and cow manure. Its design, aimed at encouraging maximum data storage in minimal space, is a test for farmer ingenuity. Called also shed sheet.
References in classic literature ?
The same man who will pay six prices for the best seed-corn, and who will allow nothing but high-grade cattle in his barn, will at the same time be content with the shabbiest and flimsiest telephone service, without offering any other excuse than that it is cheap.
It was a tale told serially by Cloke in the barn, or his wife in the dairy, the last chapters reserved for the kitchen o' nights by the big fire, when the two had been half the day exploring about the house, where old Iggulden, of the blue smock, cackled and chuckled to see them.
502-503) While it is yet midsummer command your slaves: `It will not always be summer, build barns.
Jurgis went without a word; but as he passed round the barn he came to a freshly ploughed and harrowed field, in which the farmer had set out some young peach trees; and as he walked he jerked up a row of them by the roots, more than a hundred trees in all, before he reached the end of the field.
They went into the barn, arid hauled their parcels with a bit of string to the top of the haymow.
Martin had let the contract for the new house and barn to Silas Fletcher, Fallon's leading carpenter, who had the science of construction reduced to utter simplicity.
Tess knew that it was impossible to go on with the swedes; and by the time she had finished breakfast beside the solitary little lamp, Marian arrived to tell her that they were to join the rest of the women at reed-drawing in the barn till the weather changed.
On the way over to the wood-lot one of the greys slipped on a glare of ice and cut his knee; and when they got him up again Jotham had to go back to the barn for a strip of rag to bind the cut.
Pray get it at once, and I will set to work at my barn this very day.
They told her where the barn was and how she should stand and listen, and they handed her a fur cloak.
She pointed to a long barn or boathouse almost upon the beach.
Again outside, he led the horse around behind the barn and invaded the orchard.