GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Opener (?), n.
   1. One who, or that which, opens. “True opener of my eyes.”  Milton.
   
   [1913 Webster]
   
   
   2. Specifically: A bottle opener or a can opener; as, “you need an opener to get the cap off”.
   
   [PJC]