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transmissometer

[trans-muh-som-i-ter, tranz-]
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noun Meteorology.
  1. an instrument for measuring visibility or the transmission of light in the atmosphere.
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Origin of transmissometer

First recorded in 1930–35; transmiss(ion) + -o- + -meter
Also called hazemeter, transmittance meter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018