Longest word in Spanish

This article describes some of the longest words in the Spanish language.

[1] The word has a 22-letter synonym: esternocleidomastoideo,[2][3][4] which is shorter because it omits the Latin prefix occipito- ('occipital').

[4] The 24-letter word electroencefalografistas, plural of electroencefalografista, means 'electroencephalographists' or 'electroencephalographers': specialists in the brain measurement technology of electroencephalography (EEG).

[7] In the table below, all of the Spanish nouns except for arteriosclerosis can be pluralised by adding an s (es for internacionalizaciones) to the end.

The RAE column indicates whether the Real Academia Española lists and defines the word in the Diccionario de la lengua española, its official dictionary.