ee/i/
Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.
How to pronounce ecosystems in American English
EE·koh·sihs·tuhmz
Start here
Americans pronounce ecosystems as EE-koh-sihs-tuhmz (/ˈikoʊˌsɪstəmz/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "He studies oceanography to understand marine ecosystems" or "Overfishing threatens the stability of marine ecosystems" — more examples below.
Now you try.
Record yourself saying "ecosystems" and play it back. The mic stays on your device — nothing's uploaded.
Sound by sound
Every sound in "ecosystems".
4 syllables, 10 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
k/k/
Raise the back of your tongue to touch the soft palate (velum). Stop the air, then release.
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.
s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
ih/ɪ/
Drop your jaw slightly with relaxed lips. Touch the tongue tip behind the bottom front teeth and arch the top-front toward the roof.
s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
t/t/
Touch the tip or front edge of your tongue to the roof of your mouth just behind your teeth. Keep your jaw relaxed. Stop the air, then release with a puff.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
m/m/
SyllabicThe schwa before M disappears — M becomes the vowel of the syllable. Go straight from the previous consonant to M.
z/z/
Same position as S, but add vocal cord vibration. Feel the buzz.
In real conversation
Hear "ecosystems" in the wild.
Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
Find another
Looking for a different word or sentence?
Search the entire library
/
Press / anywhere to focus the search box.
Watch out
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
01
Inserting a vowel before the syllabic consonant.
In "ecosystems", the short unstressed vowel before "m" disappears — the schwa is absorbed and the "m" becomes the syllable nucleus on its own. Schwa is absorbed — consonant becomes the syllable nucleus.
ecosystems→EE·koh·SIHS·tuhmz
02
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch EE — keep everything else short and quick.
ee·KOH·SIHS·TUHMZ→EE·koh·SIHS·tuhmz
03
Pronouncing the unstressed syllable too fully.
Don't pronounce the third syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.
EE·koh·sihs·TUHMZ→EE·koh·SIHS·tuhmz
Questions
Questions people ask about this.
How is "ecosystems" stressed in American English?
Stress falls on the first syllable — say "EE" with a longer, fuller vowel and keep every other syllable short and quick. The respell "EE-koh-sihs-tuhmz" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why does the fourth syllable in "ecosystems" 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 "EE-koh-sihs-tuhmz" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "ecosystems" 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 "EE-koh-sihs-tuhmz" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
Stop reading about "ecosystems". Start saying it.
SayWaader is the AI pronunciation coach for American English. Practice 5 minutes a day. Get a 5-axes accent assessment. Sound like you live here.