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The description of the word you requested from the astronomical dictionary is given below.
The Small Magellanic Cloud is a small, irregular galaxy that is very close to our own Milky Way Galaxy, at about 210,000 lightyears from us. The Small Magellanic Cloud is in the constellation Tucana and can (sometimes) be seen with the unaided eye from places south of 30 degrees north latitude.
The Small Magellanic Cloud (abbreviation SMC) is called "Nubecula Minor" in Latin, and is also called NGC 292.