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tera-hertz
tera-hertz n.
Brit. 
/ˈtɛrəhəːts/
, /ˈtɛrəhəːts/U.S. /ˈtɛrəˌhərts/
/ˈtɛrəˌhərts/ΚΠ
1970 McGraw-Hill Yearbk. Sci. & Technol. 233/1 M. A. Duguay and coworkers..tuned a mode-locked He-Ne laser..from −45 to +45 GHz, about the central optical frequency of 473·61 terahertz.
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