Gum from an acacia tree; used as a thickener (especially in candies and pharmaceuticals) WordNet 3.0 & Open English WordNet

Gum arabic is a natural gum originally consisting of the hardened sap of two species of the Acacia tree, Senegalia senegal and Vachellia seyal. Wikipedia

Made from the sap of Acacia senegal, an Old World tree species Wikipedia Disambiguation

Gum arabic. Wiktionary

An edible substance taken from one of two species of sub-Saharan acacia trees, Senegalia senegal and Vachellia seyal. It is used in the food industry as a stabilizer (e.g. in soda, gumdrops and marshmallows) and in other industries including pharmaceuticals, paints and polishes. Wiktionary

Substance from acacia trees. Wiktionary (translation)