[ uh-neel ]
/ əˈnil /

verb (used with object)

to heat (glass, earthenware, metals, etc.) to remove or prevent internal stress.
to free from internal stress by heating and gradually cooling.
to toughen or temper.
Biochemistry. to recombine (nucleic acid strands) at low temperature after separating by heat.
to fuse colors onto (a vitreous or metallic surface) by heating.


an act, instance, or product of annealing.


Origin of anneal

before 1000; Middle English anelen, Old English anǣlan to kindle, equivalent to an- on + ǣlan to burn, akin to āl fire

Related forms

an·neal·er, nounun·an·nealed, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for anneal

British Dictionary definitions for anneal


/ (əˈniːl) /


to temper or toughen (something) by heat treatment
to subject to or undergo some physical treatment, esp heating, that removes internal stress, crystal defects, and dislocations
(tr) to toughen or strengthen (the will, determination, etc)
(often foll by out) physics to disappear or cause to disappear by a rearrangement of atomsdefects anneal out at different temperatures


an act of annealing

Derived Forms

annealer, noun

Word Origin for anneal

Old English onǣlan, from on + ǣlan to burn, from āl fire
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012