When you anneal metal or glass, you heat it and then cool it in order to make it less brittle and more malleable.

Metallurgists — engineers who specialize in the properties and uses of metals — have to know a variety of methods used to anneal different kinds of metals. You can also anneal glass, to make it stronger and to help keep it from shattering.

Definitions of anneal

v bring to a desired consistency, texture, or hardness by a process of gradually heating and cooling

normalize, temper
Type of:
harden, indurate
make hard or harder

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