aposaturnium en · NOUN
Etymology
From apo- + Saturn + -ium, Latin form of -ion.
Meanings
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(no-plural) Apoapsis around Saturn
If they were exactly following such a periodic solution, then, at a conjunction of the two satellites, that is, when φ = 0, we would have l₁= 0, that is, Enceladus, which is on the inner of the two orbits, would be at perisaturnium, and alsol₂= π, so that Dione, which is on the outer of the two orbits, would be at aposaturnium.
2013, B.A. Steves, Archie E. Roy, The Dynamics of Small Bodies in the Solar System, →ISBN: