outermost

Preposition: of

• moon: Oberon, outermost of the five major moons, is old, heavily cratered, and shows little signs of internal activity.
• planet: From the sphere of Saturn, the outermost of the traditional planets and the traditional guardian of Time and History.

Modifies a noun

• layer: All the padding will be contained by the " ticking " - the mattress's outermost layer of tightly woven strong fabric.
• planet: The probe is due to arrive at the outermost planet of the solar system in July 2015.
• sphere: The answer is that the outermost sphere of stars has no surroundings and so has no place.
• electron: In a solid, each atom loses the outermost electron, which takes part in bonding.
• circle: He called the outermost circle the circle of the Same.
• ring: The outermost ring represents the alien human presence in the region.