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 tiononquin bean. [Written also tonca bean, tonga bean.]
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.