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[yoo r-uh-sil] /ˈyʊər ə sɪl/
Biochemistry. a pyrimidine base, C 4 H 4 N 2 O 2 , that is one of the fundamental components of RNA, in which it forms base pairs with adenine. Symbol: U.
Origin of uracil
1905-10; ur-1 + ac(etic) + -il, of uncertain origin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for uracil


(biochem) a pyrimidine present in all living cells, usually in a combined form, as in RNA. Formula: C4H4N2O2
Word Origin
C20: from uro-1 + acetic + -ile
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for uracil

coined in German, 1885, perhaps from urea + German Acetsäure "acetic acid" + chemical suffix -il.

Online Etymology Dictionary, © 2010 Douglas Harper
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uracil in Medicine

uracil u·ra·cil (yur'ə-sĭl)
A pyrimidine base that is an essential constituent of RNA.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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uracil in Science
A pyrimidine base that is a component of RNA. It forms a base pair with adenine during transcription. Uracil is therefore structurally analogous to thymine in molecules of DNA. Chemical formula: C4H4N2O2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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