[dih-frak-tom-i-ter, dif-rak-]
noun Physics.
an instrument that is used to study atomic crystal structure by measuring the angles at which x-rays, neutrons, or electrons are diffracted by matter.

1905–10; diffract + -o- + -meter

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World English Dictionary
diffractometer (ˌdɪfrækˈtɒmɪtə)
physics an instrument used in studying diffraction, as in the determination of crystal structure by diffraction of X-rays

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Example sentences
The modern diffractometer is aligned for optimum resolution.
The diffractometer zero correction refinement flag is found on the histogram panel, as seen below.
The diffractometer system is monitored by a drift sample such as aluminum.
The powder-diffractometer is used primarily for undergraduate instruction.
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