Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An instrument or apparatus for measuring or detecting tithonicity; an actinometer.

from the GNU version of the Collaborative International Dictionary of English

  • n. An instrument or apparatus for measuring or detecting tithonicity; an actinometer.

from The Century Dictionary and Cyclopedia

  • n. An instrument devised by Dr. John W. Draper (1844) to measure the tithonic or chemical action of light-rays by their effect in causing the chemical union of chlorin and hydrogen. See the quotation.

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