Merriam-Webster Collegiate Dictionary - pannier

 also panier  noun  Etymology: Middle English panier, from Anglo-French paner, panier, from Latin panarium, from panis bread — more at food  Date: 13th century  1. a large container: as  a. a basket often carried on the back of an animal or the shoulders of a person  b. one of a pair of packs or baskets hung over the rear wheel of a vehicle (as a bicycle)  2.  a. one of a pair of hoops formerly used to expand women's skirts at the sides  b. an overskirt draped at the sides of a skirt for an effect of fullness