Definition of anneal verb from the Oxford Advanced Learner's Dictionary

 

anneal

 verb
verb
BrE BrE//əˈniːl//
 
; NAmE NAmE//əˈniːl//
 
Verb Forms present simple I / you / we / they anneal
BrE BrE//əˈniːl//
 
; NAmE NAmE//əˈniːl//
 
he / she / it anneals
BrE BrE//əˈniːlz//
 
; NAmE NAmE//əˈniːlz//
 
past simple annealed
BrE BrE//əˈniːld//
 
; NAmE NAmE//əˈniːld//
 
past participle annealed
BrE BrE//əˈniːld//
 
; NAmE NAmE//əˈniːld//
 
-ing form annealing
BrE BrE//əˈniːlɪŋ//
 
; NAmE NAmE//əˈniːlɪŋ//
 
 
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anneal something (specialist) to heat metal or glass and allow it to cool slowly, in order to make it stronger or softer Word Origin Old English onǣlan, from on + ǣlan ‘burn, bake’ from āl ‘fire, burning’. The original sense was ‘set on fire’, hence (in late Middle English) ‘subject to fire, alter by heating’.
See the Oxford Advanced American Dictionary entry: anneal