Plain English Meaning
A narrow spot in a tube. When air is pushed through it, the air speeds up and its pressure falls in that narrow section.
Full Definition
A constriction in a tube or passage that causes the air or fluid flowing through it to speed up and drop in pressure at the narrowest point. This pressure drop can be used to draw fuel into an airstream, drive flight instruments, or measure airflow.
Context Anchor
You may see this term in discussions of carburetors, fuel-air mixing, older vacuum-driven instruments, and airflow through aircraft systems.
Derivation
Named after Giovanni Battista Venturi, an Italian physicist in the late 1700s who studied how fluids behave when forced through a narrowed passage. Knowing it is a person's name helps explain why the word looks unusual and is always lowercase in technical use.