Magellanic-cloud definitions

Either of two irregular galaxies visible to the naked eye in the S constellations Dorado, Mensa, and Tucana: the larger one is the closest external galaxy to the Milky Way and the smaller one is the second closest.
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(astronomy) Either of two irregular galaxies that are close companions of our Milky Way galaxy.
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Origin of magellanic-cloud

After Portuguese explorer Ferdinand Magellan.