GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Interferometer (?), n. [See Interfere and -meter.] (Physics) An instrument for measuring small movements, distances, or displacements by means of the interference of two beams of light; -- formerly also called also refractometer, but that word now has a different meaning.
   
   [Webster 1913 Suppl. +PJC]