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plural umbones or umbos or umboes
(historical) The boss of a shield, at or near the middle and usually projecting, sometimes in a sharp spike. quotations
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.
1786, Francis Grose, A Treatise on Ancient Armour and Weapons, page xii
serves as the umbo of the region’s so-called Silicon Shield
2023 March 21, Virginia Heffernan, “I Saw the Face of God in a Semiconductor Factory”, in WIRED
(biology) A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane.
(anatomy) An inward projection of the tympanic membrane of the ear. examples
(zoology) One of the lateral prominences just above the hinge of a bivalve shell.
(mycology) A bump or protrusion on the cap of a mushroom or toadstool.