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Definition of Submillimeter wave radiation
1. Noun. (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. ¹
2. Noun. (engineering) Electromagnetic waves roughly in the band less than 1 millimeter in wavelength, used as a synonym for T-ray or T-wave ¹
3. Noun. terahertz radiation ¹
¹ Source: wiktionary.com