Venturi tube

UK: /vɛnˈtʃuːrI/ US: (ven tŏŏr′ē)

Collins Concise English Dictionary © HarperCollins Publishers::

Venturi tube / vɛnˈtjʊərɪ/ noun

1. a device for measuring fluid flow, consisting of a tube so constricted that the pressure differential produced by fluid flowing through the constriction gives a measure of the rate of flow
2. Also called: venturi a tube with a constriction used to reduce or control fluid flow, as one in the air inlet of a carburettor

Etymology: 19th Century: named after G. B. Venturi (1746–1822), Italian physicist

WordReference Random House Unabridged Dictionary of American English © 2025

ven•tu′ri tube′  (ven tŏŏr′ē), 

1. Hydraulics a device for measuring the flow of a fluid, consisting of a tube with a short, narrow center section and widened, tapered ends, so that a fluid flowing through the center section at a higher velocity than through an end section creates a pressure differential that is a measure of the flow of the fluid.

Also, Ven•tu′ri tube′. 

• named after German. B. Venturi (1746–1822), Italian physicist whose work led to its invention