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rhomboideus definition, meaning, what is rhomboideus: one of the two back muscles that connect the spine with the shoulder blades. Learn more.
A rhomboid strain is a stretch or tear of these muscles. A rhomboid spasm is a sudden tightening of the muscle that you cannot control. A rhomboid muscle strain or spasm is usually caused by overuse of your shoulder and arm. This can happen from: 1  Overhead activities, like serving a tennis ball or reaching to put objects on a high shelf.