The Collaborative International Dictionary of English v.0.48:

Upwind \Up*wind"\, v. t.
   To wind up. --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Up-wind \Up"-wind`\, adv.
   Against the wind; toward the direction from which the wind is
   blowing.
   [Webster 1913 Suppl. +PJC]

The Collaborative International Dictionary of English v.0.48:

upwind \up"wind`\, a.
   being or moving in the direction from which the wind is
   blowing.
   [PJC]

WordNet (r) 3.0 (2006):

upwind
    adv 1: toward the wind; "they were sailing leeward" [syn:
           leeward, upwind] [ant: downwind, windward]
    2: in the direction opposite to the direction the wind is
       blowing; "they flew upwind" [syn: upwind, against the
       wind, into the wind] [ant: downwind]
    adj 1: towards the side exposed to wind [syn: upwind,
           weather(a)]