noun Electricity.
a device that uses a cathode-ray tube or similar instrument to depict on a screen periodic changes in an electric quantity, as voltage or current.

1905–10; oscill(ate) + -o- + -scope

oscilloscopic [uh-sil-uh-skop-ik] , adjective
oscilloscopically, adverb
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World English Dictionary
oscilloscope (ɒˈsɪləˌskəʊp)
an instrument for producing a representation of a quantity that rapidly changes with time on the screen of a cathode-ray tube. The changes are converted into electric signals, which are applied to plates in the cathode-ray tube. Changes in the magnitude of the potential across the plates deflect the electron beam and thus produce a trace on the screen

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Word Origin & History

1915, "instrument for visually recording an electrical wave," a hybrid formed from L. oscillare "to swing" (see oscillation) + Gk. -skopion, from skopein "to look at, examine."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

oscilloscope os·cil·lo·scope (ə-sĭl'ə-skōp')
An electronic instrument that produces an instantaneous trace on the screen that corresponds to oscillations of voltage and current.

os·cil'lo·scop'ic (-skŏp'ĭk) adj.
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American Heritage
Science Dictionary
oscilloscope   (ə-sĭl'ə-skōp')  Pronunciation Key 
An electronic instrument used to observe and measure changing electrical signals. The amplitude of the signal as it varies with time is displayed graphically on a screen as a line stretching from left to right, with displacements up and down indicating the amplitude of the signal. Oscilloscopes are used to diagnose problems in electronic signal-processing devises, such as computers or stereos, and to monitor electrical activity in the body, such as that of heartbeats.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It had a big cart with an oscilloscope that the patient had to move around.
One of the two privates on duty looks at the radar oscilloscope and can't
  believe his eyes.
As he sat in the gloomy lab, watching neural signals dance in green light
  across an oscilloscope, he noticed something strange.
The results were displayed as a wave on the oscilloscope.
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