tucum

1 less commonly tucum palm a :  any of several chiefly Brazilian palms of the genus Astrocaryum (especially A. tucuma) with leaf bases that yield a coarse fiber used especially for cordage and hats and with seeds that yield an edible oil b :  a low spiny Brazilian palm (Bactris setosa) with leaves that yield a long strong fiber held to resemble wool and used locally for bags or other containers, fishing nets, and shoemakers' twines

2 :  the fiber of a tucum