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diaphanometer

[dahy-af-uh-nom-i-ter]
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noun
  1. an instrument for measuring the transparency of a solid, liquid, or gas.
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Origin of diaphanometer

First recorded in 1780–90; diaphan(ous) + -o- + -meter
Related formsdi·aph·a·no·met·ric [dahy-af-uh-nuh-me-trik] /daɪˌæf ə nəˈmɛ trɪk/, adjectivedi·aph·a·nom·e·try, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018