[gla.cial] adj [L glacialis, fr. glacies] (1656) 1 a: extremely cold: frigid "a ~ wind" b: devoid of warmth and cordiality "a ~ handshake" c: coldly imperturbable "maintained a ~ calm"
2: resembling ice in appearance "~ acetic acid" 3 a (1): of, relating to, or being any of those parts of geologic time from Precambrian onward when a much larger portion of the earth was covered by glaciers than at present (2) cap: pleistocene b: of, relating to, or produced by glaciers c: suggestive of the very slow movement of glaciers "progress on the bill has been ~" -- gla.cial.ly adv