Uranian \U*ra"ni*an\, a. (Astron.) Of or pertaining to the planet Uranus; as, the Uranian year.
Ernest is a play on a more esoteric term - Uranist - coined at this period by a German lawyer, Karl Heinrich Ulrichs, a homosexual who wrote books proving that homosexuality was congenital, hence natural. Wilde described his love of boys as Uranian.