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The description of the word you requested from the astronomical dictionary is given below.
A moon of 25 km diameter at about 133,600 km from the planet Saturn. The gravity at its surface is about 0.0002 times as strong as on Earth. The moon goes once around its planet in about 13.8 hours. The moon was discovered in 1990. Also called SXVIII (Saturn eighteen). Its provisional designation was S/1981 S13.