pyrimidine

n. heterocyclic organic compound, weak organic base; derivative of this base (esp. one that is a component of DNA or RNA)

Pyrimidine is a heterocyclic aromatic organic compound similar to benzene and pyridine, containing two nitrogen atoms at positions 1 and 3 of the six-member ring. It is isomeric with two other forms of diazine.
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n. pyrimidine, heterocyclic organic compound, weak organic base; derivative of this base (esp. one that is a component of DNA or RNA)

One of the two classes of bases in DNA and RNA. The pyrimidine bases are thymine (T) and cytosine (C) in DNA and thymine (T) and uracil (U) in RNA.

Noun
1. any of several basic compounds derived from pyrimidine
(hypernym) base, alkali
(hyponym) cytosine, C
2. a heterocyclic organic compound with a penetrating odor
(hypernym) organic compound