The description of the word you requested from the astronomical dictionary is given below.
A moon of 150 km diameter at about 52,530 km from the planet Neptune. The gravity at its surface is about 0.0025 times as strong as on Earth. The moon goes once around its planet in about 8.0 hours. The moon was discovered in 1989. Also called NV (Neptune five). Its provisional designation was S/1989 N3.