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transmissometer

American  
[trans-muh-som-i-ter, tranz-] / ˌtræns məˈsɒm ɪ tər, ˌtrænz- /

noun

Meteorology.
  1. an instrument for measuring visibility or the transmission of light in the atmosphere.


Etymology

Origin of transmissometer

First recorded in 1930–35; transmiss(ion) + -o- + -meter

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