r/r/
Curl or bunch your tongue without letting the tip touch the roof of your mouth. Brace the sides of your tongue against your upper back teeth, and round your lips slightly.
How to pronounce radio in American English
RAY·dee·oh
Start here
Americans pronounce radio as RAY-dee-oh (/ˈreɪdiˌoʊ/). In "radio", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. This is called the Flap T, the kind of sound shift that makes everyday speech feel effortless. So instead of RAY·tee·oh, you get RAY·dee·OH. Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "He turned up the volume when his favorite song came on the radio".
Now you try.
Record yourself saying "radio" and play it back. The mic stays on your device — nothing's uploaded.
Sound by sound
Every sound in "radio".
3 syllables, 5 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
ay/eɪ/
Start with your jaw slightly open and the front of your tongue forward and slightly up. Glide upward, your jaw closes a little more and your tongue arches higher toward the roof of the mouth.
d/d/
FlapQuickly bounce the front of your tongue against the roof of your mouth. Same as Flap T — a quick tap without stopping airflow.
ee/i/
Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.
oh/oʊ/
Start with your mouth slightly open, then close your jaw slightly as your lips round. Shift your tongue back slightly, then stretch the back up.
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Watch out
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
01
Saying a hard "T" in the middle.
In "radio", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. /t/ or /d/ becomes a quick tap [ɾ] — sounds like a soft D. The tongue briefly taps the ridge behind the upper teeth.
RAY-tee-oh→RAY·dee·OH
02
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch RAY — keep everything else short and quick.
ray·DEE·OH→RAY·dee·OH
Questions
Questions people ask about this.
How is "radio" stressed in American English?
Stress falls on the first syllable — say "RAY" with a longer, fuller vowel and keep every other syllable short and quick. The respell "RAY-dee-oh" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why doesn't the T sound like a T in "radio"?
In American English, when /t/ sits between two vowels with the second one unstressed, it turns into a quick D-like flap. So "radio" sounds closer to "RAY-dee-oh" than to a crisp-T pronunciation. This is the flap-T rule, one of the most distinctive sounds of casual American speech.
Is the American pronunciation of "radio" different from British English?
American English uses different vowel shapes, a relaxed retroflex R, and connected-speech tricks like flap-T and glottal-stop T that British Received Pronunciation generally avoids. The respell "RAY-dee-oh" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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