Webster's English Dictionary

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glacial

gla.cial \'gla--sh*l\ \-sh*-le-\ aj [L glacialis, fr. glacies] 1a: 
   extremely cold : FRIGID  1b: devoid of warmth and cordiality  1c: coldly 
   imperturbable  2a: of, relating to, or produced by glaciers  2b: suggestive 
   of the very slow movement of glaciers  2c1: of, relating to, or being any 
   of those parts of geologic time from Pr ecambrian onward when a much larger 
   portion of the earth was covered by glaciers than at present cap  2c2: 
   PLEISTOCENE  3: resembling ice {~ acetic acid}  - gla.cial.ly av