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plural armrests
Part of the seat of a chair that is designed to support the arm. quotations examples
Each comes in a carrying case that keeps the devices together with their accessories: the miniplug cable for your music or DVD player, for example, and the adapters for quarter-inch phono jacks and dual-pronged airplane armrest jacks.
2007 June 14, David Pogue, “Headphones to Shut Out the World”, in New York Times