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From The Collaborative International Dictionary of English v.0.48:
Gambier \Gam"bier\, n. [Malayan.] (a) The inspissated juice of a plant (Uncaria Gambir) growing in Malacca. It is a powerful astringent, and, under the name of Terra Japonica, is used for chewing with the Areca nut, and is exported for tanning and dyeing. (b) Catechu. [Written also gambeer and gambir.] [1913 Webster]