The Collaborative International Dictionary of English v.0.48:

Glaciate \Gla"ci*ate\, v. i. [L. glaciatus, p. p. of glaciare to
   freeze, fr. glacies ice.]
   To turn to ice.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Glaciate \Gla"ci*ate\, v. t.
   1. To convert into, or cover with, ice.
      [1913 Webster]

   2. (Geol.) To produce glacial effects upon, as in the scoring
      of rocks, transportation of loose material, etc.
      [1913 Webster]

   Glaciated rocks, rocks whose surfaces have been smoothed,
      furrowed, or striated, by the action of ice.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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