Etymology unclear. "The fact that Lat. taurus did not undergo metathesis like parvus and nervus suggests that it is a loanword" (Beekes, citing De Vaan). "There is no cognate in IIr. or Tocharian, whereas there are Semitic words for 'bull' which are conspicuously similar. Hence, it may have been an early loanword of the form *tauro- into the western IE languages" (De Vaan). , Further etymology uncertain: "the fact that Lat. taurus did not undergo metathesis like parvus and nervus suggests that it is a loanword" (RB, citing MDV).
Robert Beekes (with the assistance of Lucien van Beek). Etymological Dictionary of Greek. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Galimberti Jarman, Beatriz, Russell, Roy, Carvajal, Carol Styles & Horwood, Jane (red.) (2003). The Oxford Spanish dictionary: Spanish-English/English-Spanish. 3. ed. Oxford: Oxford U.P.
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
Houaiss, Antônio & MS Villar. 2001. Dicionário Houaiss da língua portuguesa. Rio de Janeiro: Instituto António Houaiss.
Trésors de la langue francaise informatisées. Centre national de ressources techniques et lexiques. http://www.cnrtl.fr/definition/
DEX online (2004-2015). Dicționare ale limbii române. https://dexonline.ro/
Dictionnaire Francais - Occitan, Occitan - Francais, Occitan de Cassignac, Arve. 2015. Dictionnaire Francais - Occitan, Occitan - Francais, Occitan de communication. Toulouse: Mobileoccitan. Can be consulted online at: http://www.panoccitan.org/
Nocentini, Alberto (2010). L'etimologico: vocabolario della lingua italiana. 1. ed. Milano: Le Monnier
Robert Farren, PIE culture words collection, 2017
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