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ultra-fast
ultra-fast adj. 
/ˌʌltrəˈfast/,
Brit. /ˌʌltrəˈfɑːst/
, /ˌʌltrəˈfɑːst//ˌʌltrəˈfast/U.S. /ˌəltrəˈfæst/
/ˌəltrəˈfæst/ΚΠ
1939 Sun (Baltimore) 28 Jan. 2/6 Ultrafast American two-engined light bombers, capable of being used for combat after they have dropped their bomb loads.
1977 J. Hedgecoe Photographer's Handbk. 41 Ultra-fast films are most useful for working in dim existing-light conditions.
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