cas·ca·ril·la 
(kăs′kə-rĭlə, käs′kə-rēə)
(kăs′kə-rĭlə, käs′kə-rēə)n.
1. A tropical shrub or tree (Croton eluteria) native to the West Indies and northern South America, having a bark that yields an aromatic spicy oil used as a flavoring and fragrance.
2. The bark of this plant.
[Spanish, diminutive of cáscara, bark; see CASCARA BUCKTHORN.]