Explanation

Quick Answer

In Spanish, un diptongo(a diphthong) is a series of two vowels that are pronounced in a single syllable.

For example, the word viernes(Friday) contains the diphthong ie in the syllable vier.

This article focuses on au, eu, iu, and ou, which are diphthongs that end with the letter u!

Spanish Diphthongs

What Is a Diphthong?

In Spanish, un diptongo is a series of two vowels that are pronounced in a single syllable. In Spanish, diphthongs can be formed by combining a strong vowel (a, e, or o) and a weak vowel (i or u), or by combining two weak vowels.

When a diphthong is made up of a strong vowel and a weak vowel, the strong vowel is stressed a bit more than the weak vowel. Check out some examples below!

Spanish Diphthong Pronunciation

Below are examples of Spanish diphthongs and their pronunciations.

DiphthongPronunciationExamples
auowaula, aunque
ai, ayayaire, hay
euehooEuropa, neutro
ei, eyeyreina, rey
iayahpiano, hacia
ieyehtierra, serpiente
ioyohradio, junio
iuyooviuda, ciudad
oi, oyoyboina, hoy
uawahagua, cuadro
uewehfuego, trueno
uiweefuimos, fuiste
uowohcuota, individuo

Is Y a Vowel?

The letter yis pronounced like a vowel when it appears at the end of a word and is preceded by another vowel.

For example: hoy(today), hay(there is/there are), and Uruguay(Uruguay).

Spanish Diphthong Accentuation

Written accents are referred to as tildesin Spanish. Here are a few tips to help you know when and where to place written accents on words that contain diphthongs.

Tips for Writing Accents on Diphthongs

TipExamples
Never accent words with a single syllable.pie(foot), cruel(cruel)
Always accent words stressed on the last syllable that end with n, s, or a vowel (excluding y).camn(truck), desps(after), bonsái(bonsai), but virrey(viceroy)
Always accent words stressed on the penultimate syllable that end with a consonant other than n or s (including y).hsped(guest), dsel(diesel), póney(pony)
Always accent words stressed on the third-to-last syllable.cnaga(swamp), náutico(nautical)

Accents and Weak/Strong Vowels

Confused about accents and weak vs. strong vowels? Here are some handy tips!

TipExamples
If a stressed diphthong is a combination of a strong vowel (a, e, or o) and a weak vowel (i or u), place the accent on the strong vowel.accn(action), alféizar(windowsill), terapéutico(therapeutic)
If a stressed diphthong is a combination of two weak vowels, place the accent on the second vowel.acfero(aquifer), cdate(take care), veintn(twenty-one)

Spanish Words with Diphthongs Ending with U

Now let's take a look at some words that have diphthongs ending with u!

SpanishEnglish
aplaudirto applaud
el aplausothe applause
el aulathe classroom
aumentarto increase
el aumentothe raise
el autothe car
auténticoauthentic
el autobústhe bus
la autonomíathe autonomy
autónomoself-employed
la autorathe author
el caucethe riverbed
la cautelathe caution
la causathe cause
cautivadorcaptivating
la ciudadthe city
el claustrothe cloister
la deudathe debt
el eucaliptothe eucalyptus
la euforiathe euphoria
EuropaEurope
el estadounidensethe American
el farmacéuticothe pharmacist
la neuronathe neuron
el neutrónthe neutron
la pausathe pause
la reuniónthe meeting
reunirseto meet
el restaurantethe restaurant
el seudónimothe pseudonym
terapéuticotherapeutic
el triunfadorthe winner
el triunfothe triumph
Ready to practice?
Master Diphthongs Ending with U with our interactive video lessons.
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