diradiation

== English == === Etymology === From Latin dīradiō (“to arrange in rays”), from dis- +‎ radius. === Noun === diradiation (uncountable) (obsolete) The emission and diffusion of rays of light. === References === “diradiation”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.