from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A single-ringed, crystalline organic base, C4H4N2, that forms uracil, cytosine, or thymine and is the parent compound of many drugs, including the barbiturates.
  • n. Any of several organic compounds derived from or structurally related to pyrimidine, especially the nitrogen bases uracil, cytosine, and thymine.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A diazine in which the two nitrogen atoms are in the meta- positions; it is the basis of three of the bases found in DNA and RNA, thymine, uracil and cytosine

from The Century Dictionary and Cyclopedia

  • n. An organic compound, composed of carbon, hydrogen, and nitrogen, so arranged that the carbon and nitrogen atoms form a ring or chain, as shown in the formula .

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of several basic compounds derived from pyrimidine
  • n. a heterocyclic organic compound with a penetrating odor


Alteration of pyridine.
(American Heritage® Dictionary of the English Language, Fourth Edition)


  • From these results Funk believed the vitamine to belong to a class of substances known as the pyrimidine bases.

    The Vitamine Manual

  • To improve the fit, researchers led by chemical biologist Nathanael Gray, PhD, prepared a group of inhibitors with a different structural scaffold, known as a pyrimidine core, which, it was thought, would mesh more thoroughly. - latest science and technology news stories

  • Recommended name pyrimidine-deoxynucleoside 2'-dioxygenase Synonyms deoxyuridine

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  • D. Sutherland, Synthesis of activated pyrimidine ribonucleotides in prebiotically plausible conditions, Nature 459, 239 (2009). doi: 10.1038/nature08013.

    Convincing Evidence for God

  • Furthermore, although Powner and colleagues 'synthetic sequence yields the pyrimidine ribonucleotides, it cannot explain how purine ribonucleotides (which incorporate guanine and adenine) might have formed.

    Convincing Evidence for God

  • Of the many difficulties encountered by those in the field, the most frustrating has been the failure to find any way of properly joining the pyrimidine nucleobases — cytosine and uracil — to ribose (Fig. 1a).

    Convincing Evidence for God

  • But Powner et al. 2 revive the prospects of the 'RNA first' model by exploring a pathway for pyrimidine ribonucleotide synthesis in which the sugar and nucleobase emerge from a common precursor (Fig. 1b).

    Convincing Evidence for God

  • Superpositions of dipole states of base pairs consisting of purine (A, G) and pyrimidine (C, T) ring structures play the role of qubits, and quantum communication (coherence, entanglement, non-locality) occur in the "pi stack" region of the DNA molecule.

    A Third Choice (ID Hypothesis)

  • The recent finding of a gene fusion encoding three pyrimidine biosynthetic enzymes, shared only by Dictyostelium, fungi andMetazoa, indicates that the amoebozoa are a true sister group of the fungi and Metazoa.

    Amoeba supports front-loading

  • To Simon and Cyclefree who hold such credulous views about evolution, I wonder if they have considered the origin of pyrimidine nucleotides, especially cytosine - has it really come from outer space as the wildest contemporary theories suggest?!

    On Thursday, the Legg report will be published along with...

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