Pronunciation: (tong'ku), [key]
1. the fragrant, black almond-shaped seed of a tall tree belonging to the genus Dipteryx (or Coumarouna), of the legume family, esp. D. odorata, of tropical South America, used in perfumes, as a source of coumarin, and as a substitute for vanilla.
2. the tree itself.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.