Quasin or Quassin: How To spell?
The word Quasin is misspelled against Quassin, a noun meaning "The bitter principle of quassia, extracted as a white crystalline substance; -- formerly called quassite."
The word Quasin is misspelled against Quassin, a noun meaning "The bitter principle of quassia, extracted as a white crystalline substance; -- formerly called quassite."