The wing root is the part of the wing on a fixed-wing aircraft or winged-spaceship that is closest to the fuselage,[1] and is the junction of the wing with the fuselage (not with a nacelle or any other body). The term is also used for the junction of the wing with the opposite wing, ie on the fuselage centerline, as with the upper wing of a biplane.[2] The opposite end of a wing from the wing root is the wing tip.