Uracil Definition
 yo͝orə-sĭl 
    noun
  
 A colorless, crystalline, pyrimidine base, C4H4N2O2, that occurs as a constituent of RNA.
 Webster's New World 
Synonyms: 
  Other Word Forms of Uracil
Noun
Singular:
 uracilPlural:
 uracilsOrigin of Uracil
- ur(ea) ac(etic) -il substance relating to - From American Heritage Dictionary of the English Language, 5th Edition 
- From ur- + (ac)etic + -ile - From Wiktionary 
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