nmr

2 definitions found

nmr - Collaborative International Dictionary of English v.0.48 :

  nuclear magnetic resonance \nu"cle*ar mag*net"ic res"on*ance\ n.
     (Physics)
     The specific absorption and re-emission of electromagnetic
     radiation at characteristic wavelengths by atomic nuclei in a
     magnetic field. It is abbreviated NMR. The wavelength of
     the radiation absorbed depends on the type of nucleus, the
     intensity of the magnetic field, and the local chemical
     environment in which the nucleus resides. It is the latter
     effect (called the chemical shift), by which atoms of
     specific elements in different chemical compounds show a
     different resonance frequency, which gives rise to the
     greatest utility of this phenomenon in analyzing the chemical
     structure of substances. Similar effects of the chemical
     environment permit the discrimination of different types of
     living tissue by virtue of their different chemical
     composition, thus permitting utilization of the phenomenon in
     medical diagnostic instruments, especially for magnetic resonance imaging
     .
     [PJC]

nmr - WordNet (r) 2.1 (2005) :

  NMR
      n 1: resonance of protons to radiation in a magnetic field [syn:
           nuclear magnetic resonance, NMR, proton magnetic resonance
           ]