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an·neal  audio  (-nl) KEY 

VERB:
an·nealed, an·neal·ing, an·neals
VERB:
tr.
  1. To subject (glass or metal) to a process of heating and slow cooling in order to toughen and reduce brittleness.
  2. To strengthen or harden.
VERB:
intr.
To become strengthened or hardened: "the time she needed for opinion to anneal around her policy" (Alexander M. Haig, Jr.).

ETYMOLOGY:
Middle English anelen, from Old English onlan, to set fire to : on, on ; see on + lan, to kindle


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