urena

1 capitalized :  a small genus of tropical herbs or shrubs (family Malvaceae) having small yellow flowers with five connate bracts, bearing fruit with hooked bristles, yielding a medicinal mucilaginous juice, and including a coarse weedy herb (U. lobata) sometimes cultivated for its fiber which is comparable to jute

2 plural -s a :  any plant of the genus Urena (especially U. lobata) b or urena lobata \-lōˈbātə, -bätə\ :  the cordage fiber derived from the urena (U. lobata)