The description of the word you requested from the astronomical dictionary is given below.
A moon of 8 km diameter at about 7,284,000 km from the planet Jupiter. The gravity at its surface is about 0.0003 times as strong as on Earth. The moon goes once around its planet in about 127.0 days. The moon was discovered in 2000. Also called JXVIII (Jupiter eighteen). Its provisional designation was S/1975 J1 = S/2000 J1.