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Explanation: short for "Intrauterine dispositive or device"
"What is an intrauterine device?
An intrauterine device, called an IUD for short, is a small, plastic, T-shaped stick with a string attached to the end. The IUD is placed inside the uterus to prevent pregnancy. Your doctor can place an IUD in your uterus during an office visit. Once in place, the IUD stays in your uterus until your doctor removes it."