black knot

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noun Plant Pathology.

a disease of plants, especially of plums and cherries, characterized by black knotlike overgrowths on the branches, twigs, etc., caused by a fungus, Dibotryon morbosa.

Nearby words

  1. black iris, the,
  2. black isle,
  3. black japan,
  4. black kite,
  5. black knight,
  6. black land,
  7. black lead,
  8. black letter,
  9. black light,
  10. black liquor

Origin of black knot

An Americanism dating back to 1835–45

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for black knot

black knot

noun

a fungal disease of plums and cherries caused by Dibotryon morbosum, characterized by rough black knotlike swellings on the twigs and branches
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012