barrel roll

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A flight maneuver in which an airplane makes a complete rotation on its longitudinal axis while approximately maintaining its original direction.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An aerobatic flying maneuver in which the pilot causes the airplane to complete one loop in the same time that the airplane completes one roll, creating the appearance that the airplane is riding on the inside of a cylinder.
• noun A movement (usually during a car crash) where a car flips on its roof, then falls back on its wheels after doing at least one full 360° horizontal rotation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a roll in which the plane follows a spiral course