as·say
 /æˈseı/  verb  , -says, -sayed, -say·ing [  + obj  ]
   technical   : to test something (such as a metal or drug) to find out what it contains
   They assayed the gold to determine its purity.
  as·say /ˈæˌseı/  noun  ,  pl   -says [  count  ]
   a gold assay