Uncia | unit of weight | Britannica (original) (raw)

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comparison to libra

• In libra
  …of the libra, the Roman uncia, is the ancestor of the English ounce.
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origin of ounce

• In ounce
  Thus, uncia designated both a unit of weight and one of length and is the source of the modern terms inch and ounce.
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Roman weight system

• In measurement system: Greeks and Romans
  …reckoned to the ounce (uncia) of 423 grains (27.41 grams), and 72 of them made the new pound (libra) of 12 ounces, or 5,076 grains (328.9 grams).
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