Definition of venturi
: a short tube with a tapering constriction in the middle that causes an increase in the velocity of flow of a fluid and a corresponding decrease in fluid pressure and that is used especially in measuring fluid flow or for creating a suction (as for driving aircraft instruments or drawing fuel into the flow stream of a carburetor)
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Merriam-Webster unabridged
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Time Traveler for venturi
The first known use of venturi was in 1887
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