Definition of tonka bean
: the coumarin-containing seed of any of several tropical American leguminous trees (genus Dipteryx, especially D. odorata) that is used in perfumes and as an artificial vanilla flavoring; also : a tree bearing tonka beans
Origin and Etymology of tonka bean
Dutch tonka(-boon) & Portuguese (fava-)tonca, perhaps of Cariban origin
First Known Use: 1796
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