The description of the word you requested from the astronomical dictionary is given below.
A moon of 79 km diameter at about 61,800 km from the planet Uranus. The gravity at its surface is about 0.0015 times as strong as on Earth. The moon goes once around its planet in about 11.1 hours. The moon was discovered in 1986. Also called UIX (Uranus nine). Its provisional designation was S/1986 U3.