To subject to or affect by glacial action.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "glaciate" in a sentence
"They show that when the world began to glaciate at the start of the Ice Age about 35 million years ago, the concentration of CO2 in the atmosphere stood at about 450ppm."