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An aircraft having an annular (barrel-shaped) wing, the engine and body being mounted within the circle of the wing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An aircraft, usually tail standing vertical/short takeoff and landing (or V/STOL), having an annular wing with the fuselage at the center.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved