UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈɑːftəˌməʊst/

US:USA pronunciation: respellingUSA pronunciation: respelling(aftər mōst′, äf- or, esp. Brit., äftər məst)

WordReference Random House Unabridged Dictionary of American English © 2020
af•ter•most  (aftər mōst′, äf- or, esp. Brit., äftər məst),USA pronunciation adj. 
  1. Nautical, Naval Termsfarthest aft;
    aftmost:The aftermost sail is called a spanker.
  2. hindmost;
  • bef. 900; after + -most; replacing Middle English aftermest, itself replacing Old English æftemest, equivalent. to æfteme- (cognate with Gothic aftuma last; æfte (see aft) + -m- superlative suffix) + (-e)st -est1

Collins Concise English Dictionary © HarperCollins Publishers::
aftermost /ˈɑːftəˌməʊst/ adj
  1. closer or closest to the rear or (in a vessel) the stern; last
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