Part of speech: adjective

Pertaining to glaciers; icy.

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Usage examples "glacial":

  1. The sun had certainly revived after the glacial periods; why should it not do so again? - "Underground Man", Gabriel Tarde.
  2. The train skirts the shore of Lough Corrib, and one has beautiful glimpses of the lake and the hills beyond; and then it plunges into a wild and desolate country, strewn with great glacial boulders, some of them poised so precariously on hill- side and cliff- edge that it seems the rattle of every passing train would bring them crashing down. - "The Charm of Ireland", Burton Egbert Stevenson.
  3. At all times difficult, this travel was now made especially dangerous by the fact that the old glacial surface was not yet covered by the hard- packed winter drifts. - "True Tales of Arctic Heroism in the New World", Adolphus W. Greely.