from The Century Dictionary.

  • noun A meteorological instrument contrived by Saussure for estimating or measuring degrees of blueness, as in the sky.

from the GNU version of the Collaborative International Dictionary of English.

  • noun An instrument for measuring degress of blueness.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An instrument for measuring the intensity of blue colour.


from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek



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  • JM is training to be a cyanometer operator to more fully understand the sky.

    February 1, 2010

  • "Humboldt started using his instruments during the voyage. The faulty knowledge and ignorance about the New World exhilarated him. When the maps of the ship's pilot disagreed with one another, he used his instruments to clarify their position. Humboldt made his outbound voyage a feast of data collecting. Being well-equipped to examine almost anything that fell under his inquisitive gaze, he regularly measured the temperature of the seawater and the intensity of the magnetic force. He took frequent astronomical readings and used his cyanometer, an instrument designed to measure blueness, to observe the color of seawater."

    --Joyce Appleby, Shores of Knowledge: New World Discoveries and the Scientific Imagination (New York and London: W.W. Norton & Co., 2013), p. 217

    December 28, 2016