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

 

assay

 verb
verb
BrE BrE//əˈseɪ//
 
; NAmE NAmE//əˈseɪ//
 
assay somethingVerb Forms present simple I / you / we / they assay
BrE BrE//əˈseɪ//
 
; NAmE NAmE//əˈseɪ//
 
he / she / it assays
BrE BrE//əˈseɪz//
 
; NAmE NAmE//əˈseɪz//
 
past simple assayed
BrE BrE//əˈseɪd//
 
; NAmE NAmE//əˈseɪd//
 
past participle assayed
BrE BrE//əˈseɪd//
 
; NAmE NAmE//əˈseɪd//
 
-ing form assaying
BrE BrE//əˈseɪɪŋ//
 
; NAmE NAmE//əˈseɪɪŋ//
 
 
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to test a metal or chemical substance, often to see how pure it is

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