Carbon

  • 61carbon-14 — noun a long lived naturally occurring radioactive carbon isotope of mass 14, used in carbon dating and as a tracer in biochemistry …

    English new terms dictionary

  • 62carbon — noun 1 (U) a simple substance that exists in a pure form as diamonds, graphite etc or in an impure form as coal, petrol etc 2 (C, U) carbon paper 3 (C) a carbon copy (1) …

    Longman dictionary of contemporary English

  • 63carbon 12 — or carbon 12 n. chem. the isotopic carbon atom used as the standard for atomic weight • Etymology: 1940–45 …

    From formal English to slang

  • 64carbon-14 — carˈbon 14 noun A radioactive isotope of carbon, used eg as a tracer element in biological studies or in dating archaeological material • • • Main Entry: ↑carbon …

    Useful english dictionary

  • 65carbon-12 — carˈbon 12 noun An isotope of carbon with a mass of 12, used as a standard in determining relative atomic and molecular weight • • • Main Entry: ↑carbon …

    Useful english dictionary

  • 66carbon 14 — noun Date: 1936 a heavy radioactive isotope of carbon of mass number 14 used especially in tracer studies and in dating old materials (as archaeological and geological specimens) …

    New Collegiate Dictionary

  • 67carbon 14 — radiocarbon (def. 1). Also, carbon 14 /kahr beuhn fawr teen , fohr /. [1935 40] * * * …

    Universalium

  • 68carbon-11 — A cyclotron produced, positron emitting radioisotope of carbon with a half life of 20.3 minutes; used in positron emission tomography (PET) …

    Medical dictionary

  • 69carbon-12 — The standard of atomic mass, 98.90% of natural carbon …

    Medical dictionary

  • 70carbon-13 — A stable natural isotope, 1.1% of natural carbon …

    Medical dictionary