To subject (glass or metal) to a process of heating and slow cooling in order to toughen and reduce brittleness.
To strengthen or harden.
To become strengthened or hardened: "the time she needed for opinion to anneal around her policy” ( Alexander M. Haig, Jr.)
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.