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black arm

American  

noun

Plant Pathology.
  1. a type or phase of bacterial blight of cotton, characterized by black, elongated lesions on the stem and branches, caused by a bacterium, Xanthomonas malvacearum.


Etymology

Origin of black arm

First recorded in 1905–10

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In 1969, the Warren Court ruled for high school students who wore black arm bands as a protest.

From Los Angeles Times • May 27, 2025

The Süddeutsche Zeitung, in its coverage of the Cologne attacks, prominently featured an illustration of a woman’s legs silhouetted in white, with the space in between taken up by a black arm and hand.

From The Guardian • Aug. 1, 2019

Turmoil at home has never been far from the minds of the Ukrainian team, and some athletes asked for permission on Wednesday to wear black arm bands while competing in order to honor those killed.

From Reuters • Feb. 20, 2014

We tied black arm bands on our left biceps in memory of cyclists who had died in collisions with motorists.

From Salon • Jun. 6, 2013

As the sun moved, the shadow of the tower moved as well, gradually lengthening, a black arm reaching out for Theon Greyjoy.

From "A Clash of Kings" by George R.R. Martin

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