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EB1911 - Volume 01 - Page 001 - 1.svg This entry lacks etymological information. If you are familiar with the origin of this term, please add it to the page per etymology instructions. You can also discuss it at the Etymology scriptorium.
Particularly: “di- + radiation? But what's the link with the number two?”


diradiation (uncountable)

  1. (obsolete) The emission and diffusion of rays of light.
    • 1725, John Harris, Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences:
      ACTINOBOLISM, is the same with the Diffusion or Diradiation of Light or Sound, by which it's carried or flows every way from its Centre.
    • 1829, London Encyclopaedia; Or, Universal Dictionary of Science:
      ACTINOBOLISM, from ακτιν, a sum beam, and βαλις, a plumb line, in physics, diffusion, or the diradiation of light or sound by which it flows every way from its centre.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for diradiation in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)