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[pen-tohs] /ˈpɛn toʊs/

noun, Chemistry.
a monosaccharide containing five atoms of carbon, as xylose, C 5 H 1 0 O 5 , or produced from pentosans by hydrolysis.
any monosaccharide containing five atoms of carbon per molecule: occur mainly in plants and the nucleic acids

pentose pen·tose (pěn’tōs’, -tōz’)
Any of a class of monosaccharides having five carbon atoms per molecule and including ribose and several other sugars.
Any of a class of simple sugars (monosaccharides) having five carbon atoms per molecule. Ribose and deoxyribose are pentoses.


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  • Pentosuria

    pentosuria pen·to·su·ri·a (pěn’tō-sur’ē-ə, -syur’-) n. The excretion of one or more pentoses in the urine.

  • Pentose phosphate pathway

    noun 1. a sequence of metabolic reactions by which NADPH is synthesized, together with ribose phosphate, part of the synthesis of nucleic acids pentose phosphate pathway n. A secondary pathway for the metabolism of glucose in tissues other than skeletal muscle, in which five-carbon sugars are synthesized and NADPH is produced in the cytoplasm outside […]

  • Pentothal

    [pen-tuh-thawl] /ˈpɛn təˌθɔl/ Pharmacology, Trademark. 1. a brand of . trademark name of an anaesthetic and hypnotic, 1935, refashioning of Thiopental, from pento-, in reference to the methylbutyl five-carbon group + first two letters of thiobarbiturate + chemical product suffix -ol. Pentothal Pen·to·thal (pěn’tə-thôl’) A trademark used for thiopental sodium.

  • Pentothal sodium

    /ˈpɛntəˌθæl/ noun 1. a trademark for thiopental sodium

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