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Meaning of head smut

head' smut"

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of cereals and other grasses, characterized by a dark-brown, powdery mass of spores replacing the affected seed heads, caused by any of several smut fungi of the genera Sorosporium, Sphacelotheca, and Ustilago.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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