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head smut

noun Plant Pathology.
  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.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018