s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
How to pronounce sediment in American English
SEH·duh·muhnt
Start here
Americans pronounce sediment as SEH-duh-muhnt (/ˈsɛdəmənt/). In "sediment", 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, and it's why Americans sound more relaxed than the textbook. So instead of SEH·tuh·muhnt, you get SEH·duh·muhnt. Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "The sediment layers reveal the geological history of the area".
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Sound by sound
Every sound in "sediment".
3 syllables, 8 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
eh/ɛ/
Drop your jaw moderately. Touch the tongue tip behind the bottom front teeth and lift the mid-front part slightly toward the roof.
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.
m/m/
SyllabicThe schwa before M disappears — M becomes the vowel of the syllable. Go straight from the previous consonant to M.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
n/n/
SyllabicThe schwa before N disappears — N becomes the vowel of the syllable. Go straight from the previous consonant to N.
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.
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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 "sediment", 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.
SEH-tuh-muhnt→SEH·duh·muhnt
02
Inserting a vowel before the syllabic consonant.
In "sediment", the short unstressed vowel before "n" disappears — the schwa is absorbed and the "n" becomes the syllable nucleus on its own. Schwa is absorbed — consonant becomes the syllable nucleus.
sediment→SEH·duh·muhnt
03
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch SEH — keep everything else short and quick.
seh·DUH·MUHNT→SEH·duh·muhnt
04
Pronouncing the unstressed syllable too fully.
Don't pronounce the first syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.
SEH·DUH·muhnt→SEH·duh·muhnt
Questions
Questions people ask about this.
How is "sediment" stressed in American English?
Stress falls on the first syllable — say "SEH" with a longer, fuller vowel and keep every other syllable short and quick. The respell "SEH-duh-muhnt" 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 "sediment"?
In American English, when /t/ sits between two vowels with the second one unstressed, it turns into a quick D-like flap. So "sediment" sounds closer to "SEH-duh-muhnt" 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 second syllable in "sediment" 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 "SEH-duh-muhnt" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "sediment" 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 "SEH-duh-muhnt" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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