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What do a.m. and p.m. stand for?

leaf rust

noun, Plant Pathology
1.
a disease, especially of cereals and other grasses, characterized by rust-colored pustules of spores on the affected leaf blades and sheaths and caused by any of several rust fungi.
Origin of leaf rust
1860-1865
1860-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Value for leaf

7
8
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