Webster's English Dictionary

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oscillograph

os.cil.lo.graph \-.graf\ \-.sil-*-'graf-ik\ \.a:s-*-'la:g-r*-fe-\ n [F 
   oscillographe, fr. L oscillare + F -graphe -graph] : an instrument for 
   recording alternating current wave forms or other elec trical oscillations 
   - os.cil.lo.graph.ic aj