Definition of aftermost adjective from the Oxford Advanced Learner's Dictionary

 

aftermost

 adjective
adjective
BrE BrE//ˈɑːftəməʊst//
 
; NAmE NAmE//ˈæftərmoʊst//
 
[only before noun](specialist) Parts of boats and ships
 
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nearest to the stern of a ship or the tail of an aircraft See related entries: Parts of boats and ships Word Origin late 18th cent.: from after (as an adjective) + -most.
See the Oxford Advanced American Dictionary entry: aftermost