tonka bean

the fragrant, black almond-shaped seed of a tall tree belonging to the genus Dipteryx (or Coumarouna ), of the legume family, especially D. odorata, of tropical South America, used in perfumes, as a source of coumarin, and as a substitute for vanilla.
the tree itself.

1790–1800; tonka probably < Tupi tõka Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tonka bean (ˈtɒŋkə)
1.  a tall leguminous tree, Coumarouna odorata, of tropical America, having fragrant black almond-shaped seeds
2.  the seeds of this tree, used in the manufacture of perfumes, snuff, etc
[C18: probably from Tupi tonka]

Collins English Dictionary - Complete & Unabridged 10th Edition
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