umbo

umbo puhekieltä A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane. For example the umbo in the integument of the larvæ of echinoderms or in the tympanic membrane of the ear.
puhekieltä One of the lateral prominence just above the hinge of a bivalve shell.
puhekieltä A bump or protrusion on the top of the cap.
puhekieltä The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
1786: It is thirteen inches diameter, made of wood covered with leather, and an iron plate decorated with nails and mouldings; the boss or umbo projects four inches. — Francis Grose, A Treatise on Ancient Armour and Weapons, page xii.
boss (of a shield etc.)
elbow (or similar projecting part)
shape (appearance or outline)