Definition of uracil in English:


Line breaks: ura¦cil
Pronunciation: /ˈjʊərəsɪl


[mass noun] Biochemistry
A compound found in living tissue as a constituent base of RNA. In DNA it is replaced by thymine.
More example sentences
  • Thymine, present in DNA, and uracil, present in RNA, also contribute to this band.
  • RNA has the same set of four bases, except that instead of thymine, RNA has uracil - commonly referred to as U.
  • The nitrogen-containing units are the bases: adenine, cytosine, guanine, and uracil.


late 19th century: from ur(ea) + ac(etic) + -il.

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