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- DictionaryGla·cial/ˈɡlāSH(ə)l/
adjective
- 1. relating to, resulting from, or denoting the presence or agency of ice, especially in the form of glaciers: "thick glacial deposits"
- 2. denoting pure organic acids (especially acetic acid) which form ice-like crystals on freezing.
noun
- 1. a glacial period.