The description of the word you requested from the astronomical dictionary is given below.
A moon of 43 km diameter at about 128,000 km from the planet Jupiter. The gravity at its surface is about 0.0018 times as strong as on Earth. The moon goes once around its planet in about 7.1 hours. The moon was discovered in 1979. Also called JXVI (Jupiter sixteen). Its provisional designation was S/1979 J3.