Definition of phugoid in English:

phugoid

adjective

Aeronautics
  • Of or relating to the longitudinal stability of an aircraft or missile flying a nominally horizontal course in a vertical plane; specifically designating a slow fore-and-aft or pitching oscillation in which the flight path assumes the form of a series of shallow waves and the aircraft undergoes synchronous increases and decreases of speed.

noun

Aeronautics
  • A phugoid oscillation.

Origin

Early 20th century; earliest use found in Frederick Lanchester (1868–1946), car and aircraft designer and engineer. From ancient Greek ϕυγή flight + -oid, with the Greek word erroneously being taken as representing the sense of flight.

Pronunciation

phugoid

/ˈfjuːɡɔɪd/