barn

¹ American  

[bahrn] / bɑrn /

noun

1. a building for storing hay, grain, etc., and often for housing livestock.

2. a very large garage for buses, trucks, etc.; carbarn.

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verb (used with object)

1. to store (hay, grain, etc.) in a barn.

barn ² American  

[bahrn] / bɑrn /

noun

Physics.

1. a unit of nuclear cross section, equal to 10 −24 square centimeter. b

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barn ¹ British  

/ bɑːn /

noun

1. a large farm outbuilding, used chiefly for storing hay, grain, etc, but also for housing livestock

2. a large shed for sheltering railroad cars, trucks, etc

3. any large building, esp an unattractive one

4. (modifier) relating to a system of poultry farming in which birds are allowed to move freely within a barn

   barn eggs

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barn ² British  

/ bɑːn /

noun

1.  b.  a unit of nuclear cross section equal to 10 ^{– 28} square metre

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barn Idioms  

1. see can't hit the broad side of a barn; lock the barn door after the horse is stolen.

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Other Word Forms

• barnlike
  adjective

Etymology

Origin of barn¹

before 950; Middle English bern, Old English berern ( bere ( see barley ¹) + ern, ǣrn house, cognate with Old Frisian fīaern cowhouse, Old High German erin, Gothic razn, Old Norse rann house; cf. ransack, rest ¹)

Origin of barn²

First recorded in 1945–50; special use of barn ¹

Explanation

A barn is an outbuilding on a farm used to keep animals or crops safe and dry. A farmer might store hay in the upper part of a barn, and have stalls for horses in the main section. In rural areas there are many barns, often built from wood and standing near a main farmhouse. Some barns have wide doors with stalls for animals inside, and a hayloft at the top, where hay or other crops can be stored. In Old English, a barn or bereærn literally meant "barley house," from bere, "barley," and aern, "house."

Example Sentences

"The piece of its upper arm bone that we have is about 4 inches long, so the entire dinosaur probably had something like a four-foot wingspan, around the size of a barn owl."

From Science Daily • Jun. 23, 2026

That music and its athletic legacy, which began in the old basketball barn on West Madison Street in Chicago.

From The Wall Street Journal • Jun. 21, 2026

On 9 September 2024, she was ordered to remove the unauthorised dwelling and cease living in the barn.

From BBC • Jun. 11, 2026

Now, with the horses out of the barn and never clop-clopping back, they’re desperate for intervention.

From The Wall Street Journal • Jun. 4, 2026

The two of us would spend long hours sitting there beside Marlene, out in some barn or shed, as she munched her hay or straw—whatever we had found for her.

From "An Elephant in the Garden" by Michael Morpurgo

Related Words

• outbuilding
• shed