Breadcrumb Home > Dictionary > Index B black arm: Meaning and Definition of Find definitions for: black' arm" Pronunciation: [key] — Plant Pathol. Plant Pathol. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Black Angus black art TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: persiflage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language