interferometer

n.
Any of several optical, acoustic, or radio frequency instruments that use interference phenomena between a reference wave and an experimental wave or between two parts of an experimental wave to determine wavelengths and wave velocities, measure very small distances and thicknesses, and calculate indices of refraction.

interferometric in'ter·fer'o·met'ric (-fîr'ə-mĕt'rĭk) adj.
interferometrically in'ter·fer'o·met'ri·cal·ly adv.
interferometry in'ter·fe·rom'e·try n.

An instrument that measures the wavelengths of light and distances. It transmits two radio signals or beams of light and uses the interference principle (how they reinforce or neutralize each other) to determine the measurement.

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The noun has one meaning:

Meaning #1: any measuring instrument that uses interference patterns to make accurate measurements of waves

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