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multimegawatt
multimegawatt adj. 
/ˌməlˌtaɪˈmɛɡəˌwɑt/, /ˌməltəˈmɛɡəˌwɑt/ producing or involving millions of watts.
Brit. /ˌmʌltɪˈmɛɡəwɒt/
, /ˌmʌltɪˈmɛɡəwɒt/U.S. /ˌməltiˈmɛɡəˌwɑt/
, /ˌməltiˈmɛɡəˌwɑt//ˌməlˌtaɪˈmɛɡəˌwɑt//ˌməltəˈmɛɡəˌwɑt/ΚΠ
1971 Sci. Amer. Sept. 44/3 With multimegawatt fast breeders now being constructed in the U.S.S.R. and in western Europe, there appears to be little doubt about their engineering feasibility.
1992 New Scientist 12 Sept. 40/2 I had seen multimegawatt hydro schemes in eastern Canada.
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