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

Word of the Day

-s (1) Plural marker.
Taken from the -s in the Latin accusative plural endings -as, -es, and -os, and generalized across all Spanish nouns.

12 August 2019 - Update 3.92

Final updates in preparation for a particularly large data update coming at the end of the month.

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.