Also found in: Dictionary, Financial, Acronyms.
Perpendicular to the fore and aft centerline of a ship.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A direction at right angles to the longitudinal axis of an aircraft.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved