A glacial period (colloquially known as an ice age).
Of, or relating to glaciers. Example: Wang Shijin is a glacier expert and director of the Yulong Snow Mountain Glacial and Environmental Observation Research Station.
Very slow.
Cold and icy. Example: After the rain and frost, the pavements were glacial.
Having the appearance of ice. Example: On cold days, glacial acetic acid will freeze in the bottle.
Cool and unfriendly. Example: He gave me a glacial stare.
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