submillimeter wave radiation

== English == === Noun === submillimeter wave radiation (uncountable) (astronomy) Electromagnetic waves with a wavelength less than one millimeter (the band begins at about 0.3 THz). A term often used by radio astronomers. (engineering) Electromagnetic waves roughly in the band less than 1 millimeter in wavelength, used as a synonym for T-ray or T-wave terahertz radiation