Scrabble Dictionary

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Yes, interferometer is playable

...and is worth 21 points.

Found in the following dictionaries

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SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Interferometer" Definition

noun

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.

Source: American Heritage Dictionary

An apparatus that utilizes the of waves (as of light) for precise determinations (as of distance or wavelength).

Source: Merriam-Webster

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