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.
Source: wiktionary
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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.
Source: wiktionary
serves as the umbo of the region’s so-called Silicon Shield
Source: wiktionary