Webster's English Dictionary

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oscilloscope

os.cil.lo.scope \a:-'sil-*-.sko-p, *-\ \-.sil-*-'ska:p-ik\ n [L oscillare + 
   ISV -scope] : an instrument in which the variations in a fluctuating 
   electrical quanti ty appear temporarily as a visible wave form on the 
   fluorescent screen of a cathode-ray tube; broadly : OSCILLOGRAPH - 
   os.cil.lo.scop.ic aj