Dictionary.com
Thesaurus.com

arroba

American  
[uh-roh-buh, ahr-raw-bah] / əˈroʊ bə, ɑrˈrɔ βɑ /

noun

plural

arrobas
  1. a symbol (@) that is used to link a username to a domain name, used at the beginning of Twitter handles, and in other identifying designations on the internet in Spanish-speaking countries.

  2. a Spanish and Portuguese unit of weight of varying value, equal to 25.37 pounds avoirdupois (9.5 kilograms) in Mexico and to 32.38 pounds avoirdupois (12 kilograms) in Brazil.

  3. a unit of liquid measure of varying value, used especially in Spain and commonly equal (when used for wine) to 4.26 U.S. gallons (16.1 liters).


arroba British  
/ əˈrəʊbə /

noun

  1. a unit of weight, approximately equal to 11 kilograms, used in some Spanish-speaking countries

  2. a unit of weight, approximately equal to 15 kilograms, used in some Portuguese-speaking countries

  3. a liquid measure used in some Spanish-speaking countries with different values, but in Spain used as a wine-measure, approximately equal to 16 litres

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of arroba

First recorded in 1550–1560; from Spanish, Portuguese, from Arabic al rubʿ “the fourth part, a quarter (of the qintār), from Common Semitic arbaʿ “four”; see quintal

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The wax is worth sixteen or twenty reals an arroba, and a jar of honey one real.

From The Philippine Islands, 1493-1898 — Volume 22 of 55 1625-29 Explorations by early navigators, descriptions of the islands and their peoples, their history and records of the catholic missions, as related in contemporaneous books and manuscripts, showing the political, economic, commercial and religious conditions of those islands from their earliest relations with European nations to the close of the nineteenth century. by Robertson, James Alexander

Farm produce is generally sold by the arroba or fanega; the vara is used in lineal measurement, and the cuadra is used by country people in land measurement.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" by Various

I saw one give 16 skeins of cotton for three ceotis113-1 of Portugal, equal to one blanca of Spain, the skeins being as much as an arroba of cotton thread.

From The Northmen, Columbus and Cabot, 985-1503 by Olson, Julius E.

Let his diligence when he preaches be not long, but fervid; for one onza of gold is worth more than an arroba of straw.

From The Philippine Islands, 1493-1898 — Volume 28 of 55 1637-38 Explorations by Early Navigators, Descriptions of the Islands and Their Peoples, Their History and Records of the Catholic Missions, as Related in Contemporaneous Books and Manuscripts, Showing the Political, Economic, Commercial and Religious Conditions of Those Islands from Their Earliest Relations with European Nations to the Close of the Nineteenth Century by Blair, Emma Helen

A measure for liquids, the eighth of an arroba, equal to about half a gallon. 

From The Bible in Spain - Vol. 2 [of 2] by Borrow, George Henry