Pitot tube

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A device, essentially a tube set parallel to the direction of fluid-stream movement and attached to a manometer, used to measure the total pressure of the fluid stream.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun measuring instrument consisting of a right-angled tube with an open end that is directed in opposition to the flow of a fluid and used to measure the velocity of fluid flow
• noun measuring instrument consisting of a combined Pitot tube and static tube that measures total and static pressure; used in aircraft to measure airspeed