onza

1. (feminine) English or American ounce, a unit of mass equivalent to 28.35 g
2. (feminine, historical) onza, Spanish ounce, a traditional unit of mass equivalent to about 28.76 g

Etymology

Inherited from Latin: uncia

Cognate with Spanish: onza

Cognate with Portuguese: onça

Cognate with Catalan: unça

Cognate with French: once

Cognate with Italian: oncia

Cognate with English: ounce

In summary

From Latin uncia (“unit, ¹⁄₁₂ Roman pound”). As an English unit, a calque of ounce. Cognate with Spanish onza, Portuguese onça, Catalan unça, French once, Italian oncia, and English ounce and inch.