The description of the word you requested from the astronomical dictionary is given below.
A moon of 26 km diameter at about 76,420 km from the planet Uranus. The gravity at its surface is about 0.0000 times as strong as on Earth. The moon goes once around its planet in about 15.3 hours. The moon was discovered in 1999. Also called UXXV (Uranus twenty-five). Its provisional designation was S/1986 U10.