Толковый словарь английского языка - anneal

verb Etymology: Middle English anelen to set on fire, from Old English onǣlan, from on + ǣlan to set on fire, burn, from āl fire; akin to Old English ǣled fire, Old Norse eldr Date: 1664 transitive verb 1. to heat and then cool (as steel or glass) usually for softening and making less brittle, to heat and then cool (double-stranded nucleic acid) in order to separate strands and induce combination at lower temperature with complementary strands, strengthen, toughen, intransitive verb to be capable of combining with complementary nucleic acid by a process of heating and cooling