GNU Collaborative International Dictionary of English

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Found one definition

1.       
   densitometer n.
   1. an instrument for determining optical or photographic density.  A variety capable of measuring optical density of a sample at a number of different wavelengths, is called a spectrophotometer.
   
   [WordNet 1.5]
   
   
   2. same as densimeter.
   
   [PJC]