/af"teuhr mohst', ahf"-/ or, esp. Brit., /ahf"teuhr meuhst/ , adj.
1. Naut. farthest aft; aftmost: The aftermost sail is called a spanker.
2. hindmost; last.
[ bef. 900; AFTER + -MOST; r. ME aftermest, itself r. OE aeftemest, equiv. to aefteme- (c. Goth aftuma last; aefte (see AFT) + -m- superl. suffix) + ( -e ) st -EST 1 ]