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What is the longest word in Spanish accepted by the Real Academia Española? What about words not officially accepted by the RAE?

¿Cuál es la palabra en español más larga aceptada por la Real Academia Española? ¿Y la palabra no oficialmente aceptada por la RAE?

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In Mexico, it's got to be poquitititititititititititititititititititititititititito. As in, > —¿Quiere salsa? > —Sí, un poquitititititititititititititititititititititititititito. –  Michael Wolf Apr 1 '12 at 14:45
The longest word that's part of my vocabulary is otorrinolaringólogo. (Ear, nose and throat specialist). –  Walter Mitty Mar 28 '13 at 0:58
Supercalifragilísticoexpialidoso ♫ Aunque suene extravagante, raro, y espantoso, si se dice con soltura sonará armonioso... :p –  Arkana Apr 30 '13 at 7:15
I wouldn't accept chemical words nor medical words, they are not typical spanish words, most people don't use them and most of the time they are not even spanish. Some other words are just artifical words, maybe correct but nobody uses them. I would take "anticonstitucionalmente" –  skan Mar 19 at 0:29

7 Answers 7

up vote 7 down vote accepted

Its difficult to give a reliable source for this, but searching in google it appears these words, for example in this page. But it's difficult to say this because there are lots of technical terms which are difficult to list, because many of them can be formed by adding a lot of prefixes.

  • Longest word:

Ciclopentanoperhidrofenantreno (30 letters) - Sterane

(31 letters in plural): Ciclopentanoperhidrofenantrenos

(wikipedia entry for it)

  • Longest accepted word by RAE

Electroencefalografista (23 letters) - An expert in Electroencephalography

in plural it even has one letter more (24 letters) as electroencefalografistas

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See also: en.wikipedia.org/wiki/Longest_word_in_Spanish –  jrdioko Apr 2 '12 at 23:15
Actually, the longest word accepted by the RAE is contencioso-administrativo. –  Chewie Sep 23 '13 at 14:23

According to this page:

Superextraordinarísimo, (22-letters) was once listed as the word most often cited to be the longest in spanish. (It means "most superextraordinary"), however superextraordinarísimo seems arbitrary at best. For one thing, the word isn't in real use. As of this writing, a Google search shows not a single instance where the word was used on a Spanish-language Web site — except on pages listing what they called the longest Spanish words. And superextraordinarísimo has two other strikes against it: If one is going to create words by adding prefixes and suffixes, one could just as well make a 27-letter word by using the adverbial form, superextraordinarísimamente. Or one could just as easily use longer root words, ending up with words such as superespectacularísimamente ("most superspectacularly"). But again they're hypothetical words rather than ones that get legitimate use.

Also, the longest English word listed in an accepted dictionary is reported to be pneumonoultramicroscopicsilicovolcanokoniosis, a type of lung disease. Conversion of the word to Spanish, which is made easy by the fact that all the roots have Spanish cognates, presumably would be neumonoultramicroscopicosiliciovolcanconiosis (45 letters), or something similar. But such words would probably be considered spurious rather than legitimate Spanish.

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Una que es bastante cómica es


que, no sin cierta ironía, significa: Miedo irracional a la pronunciación de palabras largas, científicas o poco comunes en el lenguaje coloquial.

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When I was a kid they kept telling us at class that "esternocleidomasteoideo" (22 letters) was the longest word in Spanish.

Of course, I can see it wasn't true :D

Just thought I should share.

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Same thing here, but with magnetofluidohidrodinámica 26 letters). –  Alpha Mar 30 '12 at 6:33
I'm way behind: otorringolatingologo –  cbarg Feb 26 '13 at 4:52

Tataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratataratatarabuelo beats all other answers so far...

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That must be Adam. –  JoulSauron Mar 16 at 10:44

A mi me parece que contrarevolucionariamente es mas larga(25 letras) o anticontrarevolucinariamente que cuenta con 29 letras. También anticontrarevolucionariamentísimamente (38 letras).


Él se comportó antirevolucionariamentísimamente.

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a que viene del gobierno cubano esa palabra o de venezuela :) –  Emilio Gort Feb 21 '14 at 2:00

anticonstitucionalmente = unconstitutionally (RAE)
laparosalpingooforotomía = a surgical intervention (NO RAE)

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protected by Diego Mar 14 at 17:03

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