outermost
adjectiveUK /ˈaʊtəməʊst/
US /ˈaʊtərmoʊst/
The outermost thing is the one farthest out on the outside.
The outermost layer of the onion is dry and papery.
OTHER MEANINGS
2. Situated at the greatest distance from the center or inside.
The outermost planets of the solar system are the hardest to see.
3. Being the final or most distant part of a series or range.
They explored the outermost islands of the archipelago.
4. The most extreme or remote limit of something.
The outermost reaches of the forest were never mapped.