an open-ended right-angled tube pointing in opposition to the flow of a fluid and used to measure pressure.
(also pitot-static tube, pitot head) a device consisting of a pitot tube inside or adjacent to a parallel tube closed at the end but with holes along its length, the pressure difference between them being a measure of the relative velocity of the fluid, or the airspeed of an aircraft.
late 19th century: named after Henri Pitot (1695–1771), French physicist
pitot tube in other Oxford dictionaries
Definition of pitot tube in the US English dictionary