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megametre
megametre n.
Brit. 
/ˈmɛɡəˌmiːtə/
, /ˈmɛɡəˌmiːtə/U.S. /ˈmɛɡəˌmidər/
/ˈmɛɡəˌmidər/ΚΠ
1902 Encycl. Brit. XXXIII. 812/1 Megametre (astronomy)..1,000,000 metres.
1998 Nature 28 May 317/1 MDI dopplergrams reveal strong localized upward and downward mass flows during the X-ray impulse.., 3–5 megametres (Mm) across.
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