Pitot tube n 1: 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 [syn: {Pitot tube}, {Pitot}] 2: measuring instrument consisting of a combined Pitot tube and static tube that measures total and static pressure; used in aircraft to measure airspeed [syn: {Pitot-static tube}, {Pitot head}, {Pitot tube}]