The description of the word you requested from the astronomical dictionary is given below.
A moon of 98 km diameter at about 7,231,000 km from the planet Uranus. The gravity at its surface is about 0.0021 times as strong as on Earth. The moon goes once around its planet in about 587.5 days. The moon was discovered in 1997. Also called UXVI (Uranus sixteen). Its provisional designation was S/1997 U1.