Definitions
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noun (plural umbones or umbos)
  1. (Armor) The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
Quotations
  • 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.
    1. A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larví¦ of echinoderms or in the tympanic membrane of the ear.
    2. (zoology) One of the lateral prominence just above the hinge of a bivalve shell.

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