b/b/
Press your lips together, add vocal cord vibration, then release.
How to pronounce biodiversity in American English
bahy·oh·duh·VUR·suh·tee
Start here
Americans pronounce biodiversity as bahy-oh-duh-VUR-suh-tee (/ˌbaɪoʊdəˈvɜrsəɾi/). In "biodiversity", 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 bahy·oh·tuh·VUR·suh·tee, you get BAHY·oh·duh·VUR·suh·tee. Stress falls on the fourth syllable — keep everything else short and quick. You'll hear it in sentences like "Biodiversity is essential for a healthy and resilient planet" or "Scientists warn that biodiversity loss poses existential threats" — more examples below.
Now you try.
Record yourself saying "biodiversity" and play it back. The mic stays on your device — nothing's uploaded.
Sound by sound
Every sound in "biodiversity".
6 syllables, 11 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
ahy/aɪ/
Start with your jaw open wide and your tongue resting low and flat. Glide the front of your tongue up toward the roof of your mouth as your jaw closes halfway.
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.
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.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
v/v/
Lift your bottom lip so its inner edge (where the wet part meets the dry part) touches the very bottom of your top front teeth. Add vocal cord vibration as you blow air through.
ur/ɜr/
Flare your lips and push them away from the face. Lift the middle of your tongue toward the roof of the mouth.
s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
t/t/
FlapQuickly bounce the front of your tongue against the roof of your mouth. Don't stop the airflow — just a quick tap.
ee/i/
Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.
In real conversation
Hear "biodiversity" in the wild.
Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
"Biodiversity is essential for a healthy and resilient planet."
bahy·oh·duh·VUR·suh·tee ihz uh·SEHN·shuhl fer uh HEHL·thee and ruh·ZIHL·yuhnt PLA·nuht
"Scientists warn that biodiversity loss poses existential threats."
SAHY·uhn·tuhsts WORN dhuht bahy·oh·duh·VUR·suh·tee LAHS POH·zuhz ehg·zuh·STEHN·shuhl THREHTS
"She is researching the effects of climate change on biodiversity."
shee ihz ruh·SUR·chuhng dhee uh·FEHKTS uhv KLAHY·muht CHAYNJ ahn bahy·oh·duh·VUR·suh·tee
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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 "biodiversity", 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.
bahy-oh-tuh-VUR-suh-tee→BAHY·oh·duh·VUR·suh·tee
02
Stressing the wrong syllable.
Stress falls on the fourth syllable, not the others. Stretch VUR — keep everything else short and quick.
BAHY·OH·DUH·vur·SUH·TEE→BAHY·oh·duh·VUR·suh·tee
03
Pronouncing the unstressed syllable too fully.
Don't pronounce the second syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.
bahy·oh·DUH·VUR·suh·tee→BAHY·oh·duh·VUR·suh·tee
04
Pronouncing the "R" too clearly.
Americans use a relaxed retroflex R — the tongue curls back rather than rolling. The R is one continuous sound with the vowel before it, not two separate sounds.
… (no R)→… r (curl the tongue)
Questions
Questions people ask about this.
How is "biodiversity" stressed in American English?
Stress falls on the fourth syllable — say "VUR" with a longer, fuller vowel and keep every other syllable short and quick. The respell "bahy-oh-duh-VUR-suh-tee" 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 "biodiversity"?
In American English, when /t/ sits between two vowels with the second one unstressed, it turns into a quick D-like flap. So "biodiversity" sounds closer to "bahy-oh-duh-VUR-suh-tee" than to a crisp-T pronunciation. This is the flap-T rule, one of the most distinctive sounds of casual American speech.
Why does the third syllable in "biodiversity" reduce to "uh"?
Unstressed syllables in American English collapse toward a schwa — a lazy, neutral "uh" sound. The full vowel is what textbooks teach, but in actual American speech every unstressed vowel reduces. The respell "bahy-oh-duh-VUR-suh-tee" shows the reduced form so you can hear the casual rhythm directly.
How do I pronounce the R in "biodiversity"?
Americans use a relaxed retroflex R: the tongue curls back rather than rolling, and the R is one continuous sound with the vowel before it — not two separate sounds. Don't try to pronounce a separate vowel followed by a separate R. Treat them as a single shape.
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