Big update today! We've been quite busy these last few months, but we want to wish you all a happy New Year. Today we are excited to announce that the etymologies of surnames, first names, towns, and other toponyms will be added to the Dictionary. Already-existing entries have been edited to include this information.

Huge update today. We have added dialect variants and Romance, Italic, Celtic, Germanic, Balto-Slavic, Albanian, Hellenic, Armenian, and Indo-Iranian Cognates as well as lexical material in Tyrrhenian and Afro-Asiatic languages when relevant to thousands of entries.

We've also created a new Facebook page, so follow us to receive updates, news, and other notifications.

We've received requests for additional words, so we have added 23 new ones today! Thank you to everyone for the feedback. We will add additional entries periodically, but in the meantime, please feel free to submit more requests via our Contact form.

Welcome to the Online Etymological Dictionary of Spanish (OEDoS), 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.