borrowed from Spanish, borrowed from Arabic al rubʽ "the quarter" (the unit being a quarter of a Spanish quintal), from al "the" + rubʽ "quarter," derivative of a root r-b-ʽ, whence also arbaʽa "four"
1555, in the meaning defined at sense 1
“Arroba.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/arroba. Accessed 3 Dec. 2023.
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