ɪkˈstɹɛmɪti ɪkˈstɹɛməti ˈmɛmbə ˈmɛmbɚ ˈaʊtˌɡroʊθ ˈpɹəʊsɛs a part that is joined to something larger a natural prolongation or projection from a part of an organism either animal or plant a bony process an external body part that projects from the body it is important to keep the extremities warm