pyrimidine

py·rim·i·dine  (p-rm-dn, p-)

n.

1. A single-ringed, crystalline organic base, C₄H₄N₂, that forms uracil, cytosine, or thymine and is the parent compound of many drugs, including the barbiturates.

2. Any of several organic compounds derived from or structurally related to pyrimidine, especially the nitrogen bases uracil, cytosine, and thymine.

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[Alteration of pyridine.]

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pyrimidine  (p-rm-dn)

Any of a group of organic compounds having a single six-member ring in which the first and third atoms are nitrogen and the rest are carbon. Pyrimidines include the bases cytosine, thymine, and uracil, which are components of DNA and RNA. Pyrimidine rings are also components of several larger compounds, such as thiamine and some synthetic barbiturates.

Thesaurus

Noun	1.	pyrimidine - any of several basic compounds derived from pyrimidine alkali, base - any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water; "bases include oxides and hydroxides of metals and ammonia" cytosine, C - a base found in DNA and RNA and derived from pyrimidine; pairs with guanine T, thymine - a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine
	2.	pyrimidine - a heterocyclic organic compound with a penetrating odor organic compound - any compound of carbon and another element or a radical