GNU Collaborative International Dictionary of English

Found one definition

1.       
   ‖Pulu (?), n. A vegetable substance consisting of soft, elastic, yellowish brown chaff, gathered in the Hawaiian Islands from the young fronds of free ferns of the genus Cibotium, chiefly Cibotium Menziesii; -- used for stuffing mattresses, cushions, etc., and as an absorbent.
   
   [1913 Webster]