What is "uncaria gambir"

Gambier \Gam"bier\, n. [Malayan.]

1. 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.

2. Catechu. [Written also gambeer and gambir.]

Uncaria gambir, the gambier or gambir, is a species in the genus Uncaria found in Southeast Asia, mainly Malaysia and Indonesia.