[ sahy-uh-nom-i-ter ]
/ ˌsaɪ əˈnɒm ɪ tər /
an instrument for measuring the amount and intensity of blue in light, as of the sky.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for cyanometer
An instrument called a “cyanometer,” meaning “measurer of blue,” is used for ascertaining the intensity of color in the sky.The Wonder Book of Knowledge|Various