The description of the word you requested from the astronomical dictionary is given below.
A moon of 93 km diameter at about 64,400 km from the planet Uranus. The gravity at its surface is about 0.0017 times as strong as on Earth. The moon goes once around its planet in about 11.9 hours. The moon was discovered in 1986. Also called UXI (Uranus eleven). Its provisional designation was S/1986 U2.