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zazanaca.

Headword: 
zazanaca.
Principal English Translation: 

a plant whose roots are downy and good for fueling a fire; the roots also have a medicinal value believed to alleviate flatulence, expel worms, and cure diarrhea

The Mexican Treasury: The Writings of Dr. Francisco Hernández, ed. Simon Varey, transl. Rafael Chabrán, Cynthia L. Chamberlin, and Simon Varey (Stanford: Stanford University Press, 2000), 138.