noun

1. A glacial period (colloquially known as an ice age).

Synonyms: ice age

adjective

1. Of, or relating to glaciers.

   “Wang Shijin is a glacier expert and director of the Yulong Snow Mountain Glacial and Environmental Observation Research Station.”

2. Very slow.

3. Cold and icy.

   “After the rain and frost, the pavements were glacial.”