GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Whereat , adv.
   1913 Webster
   At which; upon which; whereupon; -- used relatively.
   1913 Webster
   They vote; whereat his speech he thus renews.
   Milton.
   
   1913 Webster
   Whereat he was no less angry and ashamed than desirous to obey Zelmane.
   Sir P. Sidney.
   
   1913 Webster
   At what; -- used interrogatively; as, whereat are you offended?
   1913 Webster