What does aftermost mean?
The definition of aftermost
Aft”er*most, a. superl.
Etym: [OE. eftemest, AS. æftemest,akin to Gothic aftumist and aftuma, the last, orig. a superlative of of, with the superlative endings -te, -me, -st.]

1 Hindmost; — opposed to foremost.
2 (Naut.)
Nearest the stern; most aft.