The sixth moon of the planet Jupiter, and the smallest of its four Galilean satellites (6)
I believe the answer is:
europa
(Other definitions for europa that I've seen before include "The mother of King Minos of Crete and a moon of Jupiter" , "old bull-lover?" , "Princess who bore Zeus three sons - one of the moons of Jupiter" , "Girl carried off by Zeus disguised as a bull" , "Satellite of Jupiter" .)