magnetic compass

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.

(noun)

An example of a magnetic compass is how ships find their way on the open sea.

See magnetic compass in Webster's New World College Dictionary

an instrument for indicating geographical directions magnetically, as by the action of the earth's magnetic field on a magnetic needle

See magnetic compass in American Heritage Dictionary 4

noun

An instrument that uses a magnetized steel bar to indicate direction relative to the earth's magnetic poles.

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