noun Physics.
any instrument used to measure a gradient, as the rate of change of the geomagnetic field. Compare gradient ( def 3a ).

1800–10; gradi(ent) + -o- + -meter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gradiometer (ˌɡrædɪˈɒmɪtə)
1.  physics an instrument for measuring the gradient of a magnetic field
2.  surveying an instrument used to ensure that a long gradient remains constant

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
These accelerometers are arranged in three pairs and are aligned along three different axes of the gradiometer.
Several anomalies were identified by the radar and gradiometer suggesting possible cultural features.
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