Source : Webster's Revised Unabridged Dictionary (1913)

Glaciate \Gla"ci*ate\, v. i. [L. glaciatus, p. p. of glaciare to
   freeze, fr. glacies ice.]
   To turn to ice.

Glaciate \Gla"ci*ate\, v. t.
   1. To convert into, or cover with, ice.

   2. (Geol.) To produce glacial effects upon, as in the scoring
      of rocks, transportation of loose material, etc.

   {Glaciated rocks}, rocks whose surfaces have been smoothed,
      furrowed, or striated, by the action of ice.

Source : WordNet®

glaciate
     v 1: cover with ice or snow or a glacier; "the entire area was
          glaciated"
     2: become frozen and covered with glaciers