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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.
View image. The rhomboid muscles in your upper back connect the inner edges of your shoulder blades to your spine. 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.