Source : Webster's Revised Unabridged Dictionary (1913)

Bagasse \Ba*gasse"\, n. [F.]
   Sugar cane, as it comes crushed from the mill. It is then
   dried and used as fuel. Also extended to the refuse of
   beetroot sugar.

Source : WordNet®

bagasse
     n : the dry dusty pulp that remains after juice is extracted
         from sugar cane or similar plants