Spanish words can be very long. The average word in the Spanish language contains only 8 characters (7,9 to be exact). However, there are even words that are up to 33 characters long than can be real tongue twisters. Interestingly enough there are a lot of words in the top 100 longest words list that are are enzyms, organic compounds, acids or other terms related to chemistry.
We have created a list of the 100 longest Spanish words. Find the full list underneath. You’ll find the Spanish word, English translation and possibly an explanation of what is (if needed) in all the rows. But first let’s start with the longest word in the dictionary:
The longest word in Spanish:
hipopotomonstrosesquipedaliofobia is the longest Spanish word. This word means the fear or phobia for long words.
Also look for all Spanish words with 2 letters, 3 letters, 4 letters, 6 tellers, 7 letters or 8 letters.
100 Longest Spanish words:
See here a list of the 100 longest Spanish words in the dictionary.
Longest Spanish words | Letters | English translation | What is it? |
hipopotomonstrosesquipedaliofobia | 33 | hippopotomonstrosesquipedaliophobia | It is a phobia for / fear for long words. |
supercalifragilisticoexpialidoso | 32 | supercalifragilisticexpialidocious | Made up word from the movie Mary Poppins (1964) |
esternocleidooccipitomastoideo | 30 | sternocleidooccipitomastoid | A muscle in the neck |
amidofosforribosiltransferasa | 29 | amidophosphoribosyltransferase | An enzyme |
anticonstitucionalmente | 23 | anticonstitutionally | Opposite of constitutional |
esternocleidomastoideo | 22 | sternocleidomastoid | A muscle in the neck |
Parangaricutirimícuaro | 22 | Parangaricutirimícuaro | A village in Mexico |
aminometiltransferasa | 21 | aminomethyltransferase | An enzyme |
desoxirribonucleótido | 21 | deoxyribonucleotide | Term in biochemistry |
dinitrofenilhidrazina | 21 | dinitrophenylhydrazine | An organic compound |
butirilcolinesterasa | 20 | butyrylcholinesterase | An enzyme |
carbaminohemoglobina | 20 | carbaminohemoglobin | A compound |
estereoespecificidad | 20 | stereospecificity | A chemical reaction |
esternocleidohioideo | 20 | sternohyoid | Group of muscles |
institucionalización | 20 | institutionalization | – |
otorrinolaringología | 20 | otorhinolaryngology | A study of diseases |
palmitoiltransferasa | 20 | palmitoyltransferase | An enzyme |
acetilcolinesterasa | 19 | acetylcholinesterase | An enzyme |
acetilgalactosamina | 19 | acetylgalactosamine | An organic compound |
administrativamente | 19 | administratively | – |
antirrevolucionario | 19 | antirevolutionary, counterrevolutionary | – |
betahidroxibutirato | 19 | betahydroxybutyrate | A chemical |
betahidroxibutírico | 19 | betahydroxybutyric | A organic compound |
extraordinariamente | 19 | extraordinarily | – |
fluorodesoxiglucosa | 19 | fludeoxyglucose | An organic compound |
foliculoestimulante | 19 | follicle-stimulating | A hormone |
fosfogluconolactona | 19 | phosphogluconolactone | An organic compound |
fructooligosacárido | 19 | fructooligosaccharide | An organic compound |
glicosoaminoglicano | 19 | glycosaminoglycan | Carbohydrates] |
hidroxibenzaldehído | 19 | methoxybenzaldehyde | An organic compound |
ininterrumpidamente | 19 | uninterruptedly | – |
inmunotransferencia | 19 | immunoblot, or western blot analysis | – |
otorrinolaringólogo(a) | 19 | otorhinolaryngologist | Specialized doctor |
postestructuralismo | 19 | poststructuralism | a philosophy |
pseudocolinesterasa | 19 | butyrylcholinesterase | An enzyme |
reaprovisionamiento | 19 | reprovisionment | – |
seudopeptidoglicano | 19 | pseudopeptidoglycan | An organic compound |
succiniltransferasa | 19 | succinyltransferase | An enzyme |
adrenocorticotropo | 18 | adrenocorticotropic | A hormone |
anticonstitucional | 18 | unconstitutional | – |
antropoformización | 18 | anthropomorphization | Term in human psychology. |
aristocráticamente | 18 | aristocratically | – |
autodescubrimiento | 18 | self-discovery | – |
carboxihemoglobina | 18 | carboxyhemoglobin | – |
castellanohablante | 18 | Spanish speaker (in regions of Spain where other regional languages are prominently spoken) | – |
constitucionalidad | 18 | constitutionality | – |
constitucionalismo | 18 | constitutionalism | – |
democratacristiano | 18 | Christian Democrat | – |
desafortunadamente | 18 | unfortunately; regrettably | – |
desvergonzadamente | 18 | shamelessly, or unblushingly | – |
electrocardiógrafo | 18 | electrocardiograph | – |
electrocardiograma | 18 | electrocardiogram | – |
electronegatividad | 18 | electronegativity | – |
fosfatidilinositol | 18 | phosphatidylinositol | – |
fosfofructoquinasa | 18 | phosphofructokinase | An enzyme |
fotodesintegración | 18 | photodisintegration | – |
fotosintéticamente | 18 | photosynthetically | – |
glucosaminoglucano | 18 | glycosaminoglycan | A organic compound |
gravitacionalmente | 18 | gravitationally | – |
imperceptiblemente | 18 | imperceptibly | – |
impermeabilización | 18 | impermeabilization, waterproof | – |
incondicionalmente | 18 | wholeheartedly, unconditionally, unreservedly, unquestioningly | – |
independientemente | 18 | independently | – |
internacionalmente | 18 | internationally | – |
multidisciplinario | 18 | multidisciplinary | – |
nacionalsocialismo | 18 | National Socialism; Nazism | – |
nacionalsocialista | 18 | National Socialist; Nazi | – |
neoumbilicoplastia | 18 | neoumbilicoplasty | A procedure |
permacongelamiento | 18 | permafrost | – |
perpendicularmente | 18 | perpendicularly | – |
preternaturalmente | 18 | preternaturally | – |
quimioselectividad | 18 | chemoselectivity | – |
retrospectivamente | 18 | in retrospect | – |
satisfactoriamente | 18 | satisfactorily | – |
significativamente | 18 | significantly | – |
sobrecalentamiento | 18 | overheating | – |
superconductividad | 18 | superconductivity | – |
superenrollamiento | 18 | supercoil | A DNA segment |
supervivencialista | 18 | A survivalist | – |
termodinámicamente | 18 | thermodynamically | – |
tetranortriterpeno | 18 | tetranortriterpenoid | Chemical compounds |
accidentariamente | 17 | accidentally | – |
acetilglucosamina | 17 | acetylglucosamine | An organic compound |
acetilneuraminato | 17 | acetylneuraminate | An enzyme |
acetilneuramínico | 17 | acetylneuraminic | An acid |
acetiltransferasa | 17 | acetyltransferase, transacetylase | An enzyme |
aminociclopropano | 17 | aminocyclopropane | An acid |
antiinflacionario | 17 | anti-inflationary | – |
aprovisionamiento | 17 | provisioning | – |
arrebatadoramente | 17 | captivatingly | – |
autodeterminación | 17 | self-determination | – |
bacteriorodopsina | 17 | bacteriorhodopsin | a protein |
bidimensionalidad | 17 | bidimensionality | – |
bosnioherzegovino | 17 | someone from Bosnia and Herzegovina | – |
confidencialmente | 17 | confidentially | – |
considerablemente | 17 | considerably | – |
cuatridimensional | 17 | four-dimensional | – |
descentralización | 17 | decentralization | – |
desencadenamiento | 17 | triggering, unleashing | – |
desnaturalización | 17 | denaturation | – |
desventajosamente | 17 | disadvantageously, unprofitably, unfavorably | – |
electromagnetismo | 17 | electromagnetism | – |
experimentalmente | 17 | experimentally | – |
extraoficialmente | 17 | unofficially | – |
farmacéuticamente | 17 | pharmaceutically | – |
fitohemaglutinina | 17 | phytohemagglutinin | a protein |
Let us know if you have seen a word that we missed. We’d be happy to verify and add any words.
Interestingly enough you’ll see that over three quarters of the words are very similar to those in English. We know that English and Spanish vocabulary can be very similar. See our list over “over 750 words that are almost completely the same“. However, this is completely logical since there are so many scientific terms and names on the list which are usually not translated in a much different way throughout different languages.