GNU Collaborative International Dictionary of English

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1.       
   Dunder (?), n. [Cf. Sp. redundar to overflow.] The lees or dregs of cane juice, used in the distillation of rum. [West Indies]
   
   [1913 Webster]
   
   The use of dunder in the making of rum answers the purpose of yeast in the fermentation of flour. B. Edwards.
   
   [1913 Webster]