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Definition of Terahertz radiation
1. Noun. (engineering) Electromagnetic waves with frequencies around one terahertz. ¹
2. Noun. (engineering) Especially electromagnetic waves in the range 0.1-30 THz (or subranges there of, see T-rays or T-waves). ¹
3. Noun. submillimeter wave radiation ¹
¹ Source: wiktionary.com