phugoid /ˈfjuːɡɔɪd/adjective 1noun 1forms 1 adjective1 •Of the motion of an aircraft, missile, or other flying object: continuously oscillating in a vertical plane due to the object pitching up and climbing, thus slowing down; then pitching down and descending, thus speeding up.The Phugoid theory deals with the longitudinal stability, and the form and equations of the flight path of an aerodone. — 1908 noun1 •The motion of an aircraft, missile, or other flying object continuously oscillating in a vertical plane due to the object pitching up and climbing, thus slowing down; then pitching down and descending, thus speeding up. formsphugoids
