anneal

an·neal   (ə-nēl')    v.   an·nealed, an·neal·ing, an·neals v.   tr. To subject (glass or metal) to a process of heating and slow cooling in order to toughen and reduce brittleness. To strengthen or harden. v.   intr. To become strengthened or hardened: "the time she needed for opinion to anneal around her policy" (Alexander M. Haig, Jr.) [Middle English anelen, from Old English onǣlan, to set fire to : on, on; see on + ǣlan, to kindle.]

anneal 

Main Entry: an·neal
Pronunciation: &-'nE(&)l
Function: transitive verb
1 : to heat and then cool (as steel or glass) usually forsoftening and making less brittle
2 : to heat and then cool (nucleic acid) in order to separate strands and induce combination at lower temperatures especially with complementarystrands of a different species anneal intransitive senses
: to be capable of combining with complementary nucleic acid by a process of heating and cooling anneals well with eukaryotic DNA>