The Collaborative International Dictionary
tonquin bean
Tonka bean \Ton"ka bean`\ [Cf. F. onca, tonka.] (Bot.) The seed of a leguminous tree ( Dipteryx odorata), native of Guiana. It has a peculiarly agreeable smell, and is employed in the scenting of snuff. Called also tonquin bean.
Wiktionary
tonquin bean
n. tonka bean