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noun, Physics.
the number of neutrons minus the number of protons in an atomic nucleus.


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  • Isotopic-spin

    noun, Physics. 1. a quantum number that is related to the number of different values of electric charge that a given kind of baryon or meson may have. Symbol: I. noun 1. See isospin isotopic spin (ī’sə-tŏp’ĭk) See isospin.

  • Isotopy

    [ahy-sot-uh-pee, ahy-suh-toh-pee] /aɪˈsɒt ə pi, ˈaɪ səˌtoʊ pi/ noun, Chemistry. 1. the quality or condition of being isotopic; isotopic character.

  • Isotretinoin

    [ahy-soh-tri-tin-oh-in, -oin] /ˌaɪ soʊ trɪˈtɪn oʊ ɪn, -ɔɪn/ noun, Pharmacology. 1. a yellowish-orange to orange crystalline powder, C 20 H 28 O 2 , used in the treatment of cystic acne. /ˌaɪsəʊtrəˈtɪnəʊɪn/ noun 1. a drug related to vitamin A, used to treat severe acne that has failed to respond to other treatment isotretinoin i·so·tret·i·no·in […]

  • Isotron

    /ˈaɪsəˌtrɒn/ noun 1. (physics) a device for separating small quantities of isotopes by ionizing them and separating the ions by a mass spectrometer

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