To subject to great heat and then (often slow) cooling, and sometimes reheating and further cooling, for the purpose of rendering less brittle; to temper; to toughen.
To cool glass slowly, to minimize internal stress.
To burn colors onto a glass or other surface.
To make a double-stranded nucleic acid by pairing a single strand with a complementary strand.
To strengthen or harden. Example: The experience annealed them, strengthening their resolve.
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