Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.

Definition of Uracil (U)

Medically reviewed by Min Clinic Staff | Updated: January 2026

Uracil (U): A nucleotide base and one member of the A-U (adenine-uracil) base pair in RNA. The other base pair in RNA is G-C (guanine-cytosine).

Uracil takes the place in RNA that thymine (T) occupies in DNA.