'Tonca bean' definitions:

Definition of 'Tonca bean'

From: GCIDE
  • Tonca bean \Ton"ca bean`\ (Bot.) See Tonka bean. [1913 Webster]

Definition of 'tonca bean'

From: GCIDE
  • 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. [Written also tonca bean, tonga bean.] [1913 Webster]