A tropical American tree (Guapira discolor) of the four-o'clock family, also called poisonwood or bleeding-heart tree, with caustic sap.
From Spanish guao, from Taíno (Caribbean indigenous language) gwáo or similar term; the name transferred to the tree when Spanish colonizers encountered it in the Caribbean.
The guao's sap is so caustic it can cause severe blistering—tree sap that acts like nature's chemical weapon, used traditionally by indigenous peoples!
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