Pronunciation: (ā'lu-ron"), [key]
1. Aeron.a movable surface, usually near the trailing edge of a wing, that controls the roll of the airframe or effects maneuvers, as banks and the like.
2. a wall at the end of a roof with a single slope, as that of a church aisle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.