down·burst 
(dounbûrst′)
(dounbûrst′)n.
A powerful downward air current from a cumulonimbus cloud, typically associated with thunderstorm activity.
- autoinfection
- autoinoculable
- autoinoculation
- autointoxication
- autoloading
- autologous
- autologously
- autolysate
- autolysin
- autolysis
- autolytic
- autolyze
- automaker
- automat
- automata
- automatable
- automate
- automated teller machine
- automatic
- automatically
- automaticity
- automatic pilot
- automatic teller machine
- automatic writing
- automation