The description of the word you requested from the astronomical dictionary is given below.
A moon of 190 km diameter at about 12,179,000 km from the planet Uranus. The gravity at its surface is about 0.0041 times as strong as on Earth. The moon goes once around its planet in about 3.5 years. The moon was discovered in 1997. Also called UXVII (Uranus seventeen). Its provisional designation was S/1997 U2.