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:
Cuba, Guatemala, Nicaragua,
Peru, and Spain
|approximately 28.750 grams (UN 1966)|
|Colombia||= ¹⁄₁₆ libra = 31.25 grams (UN 1966)|
[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.