WordReference Random House Unabridged Dictionary of American English © 2026
head smut′, [Plant Pathol.]
  1. Plant Diseasesa 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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