Apedia

Axis Earth's Compass Noun  A Consisting Continuously Driven

Title gyrocompass
Text
Merriam-Webster's Collegiate Dictionary
gy·ro·com·pass

 \\ˈjī-rō-ˌkəm-pəs also -ˌkäm-\\ noun
 DATE  1910
: a compass consisting of a continuously driven gyroscope whose spinning axis is confined to a horizontal plane so that the earth's rotation causes it to assume a position parallel to the earth's axis and thus point to the true north
Webster's Third New International Dictionary, Unabridged
gy·ro·compass
\|jīrō+\ noun
Etymology: gyr- + compass
: a compass consisting of a continuously driven gyroscope whose supporting ring confines the spinning axis to a horizontal plane so that the earth's rotation causes it to assume a position parallel to the earth's axis and thus point to the true north

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