1. A disease characterized by pain, swelling, and pink coloration of the fingers and toes: Acrodynia is a syndrome caused almost exclusively by mercury poisoning in children, and causes gastrointestinal symptoms in adults in addition to anorexia, photophobia, sweating, and tachycardia (fast heart beat).
2. Etymology: from Greek acro, "extreme, top" + Greek odyne, "pain"; literally a ain in an extremity; such as, the hands or the feet.