Definition of anneals:
(v) :
(metallurgy) 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.
(v) :
To cool glass slowly, to minimize internal stress.
(v) :
(genetics, ambitransitive) To make a double-stranded nucleic acid by pairing a single strand with a complementary strand.
(n) :
(chemistry, metallurgy) An act of annealing.
(v) :
(figurative, archaic or poetic) To strengthen or harden.
(v) :
(archaic) To burn colors onto a glass or other surface.