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Like so many names of units, the onza derives from the Latin uncia.
For the Portuguese unit, see onça.
A unit of mass in Spain and South America, 20ᵗʰ century:
Chile  ,
Cuba, Guatemala, Nicaragua,Peru, and Spain  |
approximately 28.750 grams (UN 1966) |
| Colombia | = ¹⁄₁₆ libra = 31.25 grams (UN 1966) |
| Costa Rica
[Costa Rica. Ministerio de formento.] |
= 28.7539 grams. The apothecary's onza was identical.
|
| Dominican Republic | = 1 ounce avoirdupois, approximately 28.35 grams (UN 1966) |
| Honduras (and see definition 2) | 28.755 grams (UN 1966) |
| Paraguay | approximately 28.688 grams (UN 1966) |
| Mexico | 28.775 grams (UN 1966) |
In Spain, the onza also appears in apothecaries' weight, = ¹⁄₁₂ libra, about 28.8 grams.
In Valencia, Spain, a unit of length = ¹⁄₁₂ pie = 1¹⁄₃ dedo.
Doursther, page 369.
In Spain, a unit of liquid capacity used for oil, = ¼ panilla, about 31.4 milliliters, weighing 28¾ grams.
In Galicia, Spain, it was a unit of liquid capacity for wine, = ¹⁄₁₃₆₀ cañada = ¹⁄₂₀ quartillo, about 29 milliliters.
Doursther, page 370.
In Honduras, a unit of liquid capacity, approximately 28.8 milliliters.
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Last revised: 16 March 2011.
