noun Plant Pathology.
any of several diseases of plants caused by rusts and characterized by black discoloration resulting from the fungal teliospores.
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Origin of black rust
An Americanism dating back to 1780–90
Words nearby black rust
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for black rust
a stage in any of several diseases of cereals and grasses caused by rust fungi in which black masses of spores appear on the stems or leaves
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