- The definition of a magnetic compass is a device with a magnetized rod that shows direction in comparison to the magnetic poles of the Earth.
An example of a magnetic compass is how ships find their way on the open sea.
magnetic compass definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an instrument for indicating geographical directions magnetically, as by the action of the earth's magnetic field on a magnetic needle
magnetic compass definition by American Heritage Dictionary
An instrument that uses a magnetized steel bar to indicate direction relative to the earth's magnetic poles.