a.

1. 冰的；冰状的
2. 冰河的；冰河时代的
   Two thirds of the continent was covered in ice during glacial periods.

   该大陆的三分之二地区在冰河时代被冰覆盖着。

3. 冰冷的；冷淡的
   She gave me a glacial smile.

   她对我冷冷地一笑。

adj.

1. relating to ice, especially in the form of glaciers.
2. extremely cold.
   ▸unfriendly or unemotional.
3. Chemistry  denoting pure organic acids (especially acetic acid) which form ice-like crystals on freezing.

n.