The only free and comprehensive online etymological dictionary of the Spanish language

Word of the Day

tío (Noun) (m.) "uncle;" (f.) "aunt"
10th cent. From Late Latin thius 'id.,' borrowed from Ancient Greek θεῖος ‎(theîos) 'id.' Of unknown origin.
Indo-European
Romance
Asturian tíu, Portuguese tio, Catalan tio, Italian zio, Sardinian tiu
Beekes, R. S. P. Etymological Dictionary of Greek. BRILL. 2014.
Corominas, J. & J. Pascual. Diccionario crítico etimológico castellano e híspanico. 6 vols. Madrid: Gredos. 1991-1997.
Real Academia Española. Diccionario de la lengua española. Online. 23rd ed. Madrid: Espasa Calpa. 2014. http://www.rae.es/.
Sihler, A. New Comparative Grammar of Greek and Latin. Oxford University Press. 2008.

9 November 2018 - Update 3.2

A series of shadow updates were implemented over the past month: changes in formatting and font, an improved layout to display cognates in other languages, and information added.

Welcome

The Online Etymological Dictionary of Spanish is a free etymological dictionary of the Spanish language launched on August 6, 2016. An etymology is not a definition but a history of a word over time. This site provides an account of the development of the Spanish language as best as historical linguists are able to ascertain in a way that is accessible both by laymen and academics. If you enjoy using this dictionary, please consider donating to help keep this site alive.