World English Dictionary
polygraph (ˈpɒlɪˌɡrɑːf, -ˌɡræf)
1.  an instrument for the simultaneous electrical or mechanical recording of several involuntary physiological activities, including blood pressure, skin resistivity, pulse rate, respiration, and sweating, used esp as a would-be lie detector
2.  a device for producing copies of written, printed, or drawn matter
[C18: from Greek polugraphos writing copiously]

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