glacial

adjective

• 1relating to, resulting from, or denoting the presence or agency of ice, especially in the form of glaciers:thick glacial deposits a glacial lake

• 2of ice; icy:the glacial mountains of New Zealand figurativehis glacial blue eyes
• Chemistry denoting pure organic acids (especially acetic acid) that form icelike crystals on freezing.
• extremely slow (like the movement of a glacier):an official described progress in the talks as glacial

noun

• a glacial period.