From The Collaborative International Dictionary of English v.0.48:

Copal \Co"pal\ (k[=o]"pal; 277), [Sp., fr. Mexican copalli, a
   generic name of resins. --Clavigero.]
   A resinous substance flowing spontaneously from trees of
   Zanzibar, Madagascar, and South America ({Trachylobium
   Hornemannianum}, Trachylobium verrucosum, and {Hymen[ae]a
   Courbaril}), and dug from earth where forests have stood in
   Africa; -- used chiefly in making varnishes. --Ure.
   [1913 Webster]
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