from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Electromagnetic radiation with waves of frequencies ranging from 0.3 × 1012 to 3 × 1012 hertz and of wavelengths ranging from 0.1 to 1 millimeter of potential use in detection, imaging, and communications technologies.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun engineering Electromagnetic waves with frequencies around one
- noun engineering Especially electromagnetic waves in the range 0.1-30 THz (or subranges there of, see
submillimeter wave radiation
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