[pahy-rim-i-deen, pi-, pir-uh-mi-deen, -din]
noun Biochemistry.
a heterocyclic compound, C 4 H 4 N 2 , that is the basis of several important biochemical substances.
one of several pyrimidine derivatives, especially the bases cytosine, thymine, and uracil, which are fundamental constituents of nucleic acids.

1880–85; blend of pyridine and imide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyrimidine (paɪˈrɪmɪˌdiːn)
1.  a liquid or crystalline organic compound with a penetrating odour; 1,3-diazine. It is a weakly basic soluble heterocyclic compound and can be prepared from barbituric acid. Formula: C4H4N2
2.  Also called: pyrimidine base any of a number of similar compounds having a basic structure that is derived from pyrimidine, including cytosine, thymine, and uracil, which are constituents of nucleic acids
[C20: variant of pyridine]

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American Heritage
Medical Dictionary

pyrimidine py·rim·i·dine (pī-rĭm'ĭ-dēn', pĭ-)

  1. A crystalline organic base that is the parent substance of various biologically important derivatives.

  2. Any of several basic compounds derived from or structurally related to pyrimidine, especially the nucleic acid constituents uracil, cytosine, and thymine.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
pyrimidine   (pī-rĭm'ĭ-dēn')  Pronunciation Key 
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.
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