The agglutinated seeds and husks of the legumes of a South American tree (Inga Marthae). It is valuable for tanning leather, and as a dye.
the seeds and pods of certain leguminous trees and shrubs (especially of Pithecolobium parvifolium, Caesalpinia brevifolia, and Prosopis juliflora) having astringent properties and used for tanning and dyeing