onza

English or American ounce (a unit of mass equivalent to 28.35 g or 31.1 g); clipping of onza líquida, the English or American fluid ounce (a unit of liquid volume equivalent to 28.4 or 29.6 mL); onza, Spanish ounce (a traditional unit of mass equivalent to about 28.76 g)

Inherited from Latin uncia (“unit, ¹⁄₁₂ Roman pound”), ultimately from Proto-Indo-European *óynos (“one”). As an English unit, a calque of ounce. Cognate with Galician onza, Portuguese onça, Catalan unça, French once, Italian oncia, and English ounce and inch.

ounce (any large wild feline); cheetah (Acinonyx jubatus); jaguarundi (Herpailurus yagouaroundi); weasel (Mustela spp.); jaguar (Panthera onca)

Borrowed from Middle French once, from Old French lonce (“lynx”) by false division assuming the l- was an article, from Italian lonza, from Latin lynx, from Ancient Greek λύγξ (lúnx, “lynx”). Doublet of lince.