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BUN

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bun

1  [buhn]
Use BUN in a Sentence
–noun
1. any of a wide variety of variously shaped bread rolls, usually leavened and slightly sweetened or plain, sometimes containing spices, dried currants, etc.
2. hair gathered into a round coil or knot at the nape of the neck or on top of the head in certain coiffures.
3. buns, Slang. the buttocks.
Origin:
1325–75; ME bunne, of obscure orig.
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bun

2  [buhn]
—Idiom
have a bun on, Slang. to be intoxicated: Everyone at the party seemed to have a bun on.
Origin:
1900–05; of uncert. orig.

BUN

 
blood urea nitrogen: the concentration of nitrogen in the blood in the form of urea, indicating kidney function.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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bun 1   (bŭn)   
n.  

  1. A small bread roll, often sweetened or spiced and sometimes containing dried fruit.

  2. A tight roll of hair worn at the back of the head.


[Middle English bunne, probably from Old French bugne, boil, of Celtic origin.]
bun 2   (bŭn)   
n.   Slang
A drunken spree.

[Origin unknown.]
bun 3   (bŭn)   
n.   Slang
One of the buttocks. Often used in the plural.

[Dialectal, hind part of a rabbit or squirrel, from Scottish Gaelic, stump, bottom, from Old Irish.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

bun 
1371, origin obscure, perhaps from O.Fr. bugnete "a fritter," orig. "boil, swelling," dim. of bugne "swelling from a blow, bump on the head," from Gaul. *bunia (cf. Gael. bonnach). Of hair coiled at the back of the head, first attested 1894. The first record of buns in the sense of "male buttocks" is from 1960s; but the singular form meant "tail of a hare" (c.1538) in Scot. and northern England dialect and was transferred to human beings (and conveniently rhymed with nun in ribald ballads). This may be an entirely different word.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: BUN
Pronunciation: "bE-"yü-'en
Function: noun
: the concentration of nitrogen in the form of urea in the blood
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

BUN abbr.
blood urea nitrogen

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Abbreviations & Acronyms
BUN
blood urea nitrogen
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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