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 ai, ei, oi, and ui, which are diphthongs that end with the letter i!

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 I

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

SpanishEnglish
el aceitethe oil
la aceitunathe olive
el airethe air
aisladoisolated
aislanteinsulating
el bailethe dance
el beisbolthe baseball
el boicotthe boycott
la boinathe beret
el caimánthe alligator
el circuitothe circuit
la coincidenciathe coincidence
construirto build
el cuidadothe care
la freidorathe fryer
el mosaicothe mosaic
el naipethe card
el paisajethe scenery
el peinadothe hairstyle
el peinethe comb
la reinathe queen
el reinothe kingdom
ruidosonoisy
el traidorthe traitor
el treintathirty
la vainillathe vanilla
el veintetwenty
Ready to practice?
Master Diphthongs Ending with I with our interactive video lessons.
Start first lesson