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

1905–10; ur-1 + ac(etic) + -il, of uncertain origin

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uracil (ˈjʊərəsɪl)
biochem a pyrimidine present in all living cells, usually in a combined form, as in RNA. Formula: C4H4N2O2
[C20: from uro-1 + acetic + -ile]

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Medical Dictionary

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

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Science Dictionary
uracil   (yr'ə-sĭl)  Pronunciation Key 
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.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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