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Meaning of black chaff

black' chaff'

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of wheat, characterized by dark, elongated stripes on the chaff, caused by a bacterium, Xanthomonas translucens undulosum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.