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The description of the word you requested from the astronomical dictionary is given below.
A moon of 66 km diameter at about 48,230 km from the planet Neptune. The gravity at its surface is about 0.0012 times as strong as on Earth. The moon goes once around its planet in about 7.1 hours. The moon was discovered in 1989. Also called NIII (Neptune three). Its provisional designation was S/1989 N6.