Aftermost (&unr_;), a. superl. [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.
[1913 Webster]

2. (Naut.) Nearest the stern; most aft.
[1913 Webster]