What is the meaning of Copal?

A resinous substance flowing spontaneously from trees of Zanzibar, Madagascar, and South America (Trachylobium Hornemannianum, T. verrucosum, and Hymenaea Courbaril), and dug from earth where forests have stood in Africa; -- used chiefly in making varnishes.

Source: Webster’s Revised Unabridged Dictionary (1913), via OPTED