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black arm

American

noun

Plant Pathology.

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

Manchester United are wearing black arm bands to commemorate the Munich Air Disaster.

From The Guardian • Feb. 5, 2022

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

The Georgian National Olympic Committee and its athletes wore black arm bands, black scarves and had a black patch on their flag as they walked soberly into the stadium.

From Reuters • Feb. 13, 2010

I clamped onto his thick black arm and tried to push it away but I couldn’t budge him.

From "We Were Here" by Matt De La Peña

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023