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.
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1,3-Diazine; a heterocyclic substance, the formal parent of several “bases” present in nucleic acid s (uracil, thymine, cytosine) as well as of the barbiturates.
- p. 5′-nucleotidase an enzyme that catalyzes the hydrolysis of a p.-nucleoside 5′-monophosphate to produce orthophosphate and the p. nucleoside; a deficiency of this enzyme results in accumulation of p. nucleotides leading to hemolytic anemia.
- p. transferase SYN: thiamin pyridinylase.

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py·rim·i·dine pī-'rim-ə-.dēn, pə- n
1) a weakly basic organic compound C4H2N2 of penetrating odor that is composed of a single six-membered ring having four carbon atoms with nitrogen atoms in positions one and three
2) a derivative of pyrimidine having its characteristic ring structure esp a base (as cytosine, thymine, or uracil) that is a constituent of DNA or RNA

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a nitrogen-containing compound with a ring molecular structure. The commonest pyrimidines are cytosine, thymine, and uracil, which form the nucleotide of nucleic acids.

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py·rim·i·dine (pə-rimґĭ-dēn) an organic compound, a metadiazine, C4H4N2, which is the fundamental form of the pyrimidine bases. These are mostly oxy or amino derivatives, for example, 2,4-dioxypyrimidine is uracil, 2-oxy-4-aminopyrimidine is cytosine, and 2,4-dioxy-5-methylpyrimidine is thymine, all of which are constituents of nucleic acid. See illustration of purine and pyrimidine bases, under base.

Medical dictionary. 2011.

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  • pyrimidine — [pə rim′ə dēn΄, pīrim′ə dēn΄; pir′ə mə dēn΄] n. [Ger pyrimidin < pyridin: see PYRIDINE] 1. a colorless, liquid, crystalline organic compound, C4H4N2, the fundamental form of a group of bases, some of which are constituents of nucleic acid 2.… …   English World dictionary

  • pyrimidine — pyrimidine. См. пиримидин. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

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  • Pyrimidine — Dieser Artikel wurde aufgrund von Mängeln auf der Qualitätssicherungsseite der Redaktion Chemie eingetragen. Dies geschieht, um die Qualität der Artikel aus dem Themengebiet Chemie auf ein akzeptables Niveau zu bringen. Dabei können Artikel… …   Deutsch Wikipedia

  • pyrimidine — /puy rim i deen , pi , pir euh mi deen , din/, n. Biochem. 1. a heterocyclic compound, C4H4N2, that is the basis of several important biochemical substances. 2. one of several pyrimidine derivatives, esp. the bases cytosine, thymine, and uracil,… …   Universalium

  • pyrimidine — noun Etymology: International Scientific Vocabulary, alteration of pyridine Date: 1885 1. a feeble organic base C4H4N2 of penetrating odor 2. a derivative of pyrimidine; especially a base (as cytosine, thymine, or uracil) that is a constituent of …   New Collegiate Dictionary

  • pyrimidine — (pi rim i dĭn) A basic, heterocyclic, nitrogen containing molecule with one ring that occurs in nucleic acids and other cell constituents; pyrimidines are oxy or amino derivatives of the pyrimidine skeleton. The most important pyrimidines are… …   Dictionary of microbiology

  • pyrimidine — (= 1,3 diazine) A heterocyclic 6 membered ring, planar and aromatic in character. The parent compound of the pyrimidine bases of nucleic acid …   Dictionary of molecular biology

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