Longest word in Spanish


This article describes some of the longest words in the Spanish language.
esternocleidooccipitomastoideos is the plural of the noun esternocleidooccipitomastoideo, which is the sternocleidomastoid, a muscle in the human neck. The word has a 22-letter synonym: esternocleidomastoideo, which is shorter because it omits the Latin prefix occipito-. Both words are abbreviated as ECOM.
The 24-letter word electroencefalografistas, plural of electroencefalografista, means 'electroencephalographists' or 'electroencephalographers': specialists in the brain measurement technology of electroencephalography.
The 23-letter adverb anticonstitucionalmente means 'anticonstitutionally'. Anticonstitucionalmente is also the Portuguese translation; the French translation, anticonstitutionnellement, is an exceptionally long word as well.

Long words

In the table below, all of the Spanish nouns except for arteriosclerosis can be pluralised by adding an s to the end. The adjective otorrinolaringológico can also be pluralised with an s; the plurals of the other adjectives end in es.
The RAE column indicates whether the Real Academia Española lists and defines the word in the Diccionario de la lengua española, its official dictionary.
WordLettersSyllablesPart of speechTranslation
hipopotomonstrosesquipedaliofobia3313nounhippopotomonstrosesquipedaliophobia
esternocleidooccipitomastoideo3013nounsternocleidomastoid
hexakosioihexekontahexafobia2810nounhexakosioihexekontahexaphobia
anticonstitucionalmente239adverbanticonstitutionally
electroencefalografista2310nounelectroencephalographer
esternocleidomastoideo229nounsternocleidomastoid
electroencefalografía2110nounelectroencephalography
otorrinolaringológico2110adjectiveotorhinolaryngological
internacionalización208nouninternationalization
electroencefalograma209nounelectroencephalogram
otorrinolaringología2010nounotorhinolaryngology
electrocardiografía199nounelectrocardiography
desafortunadamente188adverbunfortunately
anticonstitucional187adjectiveanticonstitutional
desconsoladamente177adverbdisconsolately
interculturalidad177nouninterculturality
arteriosclerosis166nounarteriosclerosis
electrodoméstico167nounhome appliance
inconstitucional166adjectiveunconstitutional
limpiaparabrisas167nounwindshield wiper
inexorablemente157adverbinexorably
lamentablemente156noununfortunately
paralelepípedo147nounparallelepiped