The Collaborative International Dictionary of English v.0.48:
Bagasse \Ba*gasse"\ (b[.a]*g[a^]s"), 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. [1913 Webster]WordNet (r) 3.0 (2006):
bagasse n 1: the dry dusty pulp that remains after juice is extracted from sugar cane or similar plants