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Apr 11, a pressure injury is an injury to the skin or tissue over a bony area. a pressure injury is also called a pressure sore, bedsore, wound, or decubitus ulcer. pressure injuries can form over any area but are most common on the back, buttocks, hips, and heels. workplace first aid.Ball mill - definition of ball mill by the free dictionary. define ball mill. ball mill synonyms, ball mill pronunciation, ball mill translation, english dictionary definition of ball mill. n engineering a horizontal cylinder or cone in which a substance, such as a mineral, is ground by rotation with steel or ceramic balls collins english.