gradiometer

[grey-dee-om-i-ter]

gra·di·om·e·ter

[grey-dee-om-i-ter]
noun Physics.
any instrument used to measure a gradient, as the rate of change of the geomagnetic field. Compare gradient (def. 3a).

Origin:
1800–10; gradi(ent) + -o- + -meter
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Gradiometer is always a great word to know.
So is atomic structure. Does it mean:
a particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron's negative charge
a positively charged nucleus neutralized by negatively charged electrons revolving in orbits at varying distances from the nucleus
Collins
World English Dictionary
gradiometer (ˌɡrædɪˈɒmɪtə)
 
n
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

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