"farthermost" in the adjective sense
1. farthermost, farthest, furthermost, furthest, utmost, uttermost
comparatives of `far') most remote in space or time or order
"had traveled to the farthest frontier"
"don't go beyond the farthermost (or furthermost) tree"
"explored the furthest reaches of space"
"the utmost tip of the peninsula"
Source: WordNet® (An amazing lexical database of English)
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