glacial
adjective
[ ˈɡleɪsɪəl ]
• relating to or denoting the presence or agency of ice, especially in the form of glaciers.
• "thick glacial deposits"
• denoting pure organic acids (especially acetic acid) which form ice-like crystals on freezing.
glacial
noun
• a glacial period.
Origin:
mid 17th century: from French, or from Latin glacialis ‘icy’, from glacies ‘ice’.
