English
T-ray
Initialism of t(erahertz) + ray, modelled after X-ray.
The story
Initialism of t(erahertz) + ray, modelled after X-ray. The term was coined in Bell Labs in the United States in the mid-1990s.
Today it means
noun An electromagnetic wave with a frequency intermediate between, and sharing the properties of, short radio waves and long infrared waves, generally in the 0.1 to 10 terahertz (THz) band of frequencies.
Language periods are conventional ranges, not dates for this word.
Etymograph / T-ray