The Collaborative International Dictionary of English v.0.48:

Deplete \De*plete"\, v. t. [imp. & p. p. Depleted; p. pr. &
   vb. n. Depleting.] [From L. deplere to empty out; de- +
   plere to fill. Forined like replete, complete. See Fill,
   Full, a.]
   1. (Med.) To empty or unload, as the vessels of human system,
      by bloodletting or by medicine. --Copland.
      [1913 Webster]

   2. To reduce by destroying or consuming the vital powers of;
      to exhaust, as a country of its strength or resources, a
      treasury of money, etc. --Saturday Review.
      [1913 Webster]