A rind is a thick, inedible peel. You'll have to remove the rind of your orange before you eat it.
Most rinds occur naturally, growing to cover and protect a fruit or a plant. You can also call the thick, waxy covering on a wheel of cheese a rind, or the inedible skin on a sausage or another food. The Old English root rinde originally meant "bark or crust," and later also "peel of a fruit or vegetable."