m/m/
Press your lips together. Air flows through your nose. Vocal cords vibrate.
How to pronounce molecules in American English
MAH·luh·kyoolz
Start here
Americans pronounce molecules as MAH-luh-kyoolz (/ˈmɑləˌkjulz/). The L in "molecules" is a dark L — the back of the tongue rises toward the soft palate, adding a small "uh" quality before the L. This is called the Dark L vs Light L, a small move that separates 'classroom' from 'native'. It comes out as MAH·luh·KYOOLZ. Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "Water molecules are composed of two hydrogen atoms and one oxygen atom".
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Sound by sound
Every sound in "molecules".
3 syllables, 8 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
ah/ɑ/
Relax your lips and drop your jaw significantly. The tongue tip lightly touches behind the bottom front teeth and the back part of the tongue presses down a little to create more dark space in the back of the mouth.
l/l/
Place the tip of your tongue against the alveolar ridge just behind your top front teeth, the same contact point as /t/, /d/, and /n/. The difference is what happens to the air: for /l/, you let it flow continuously around the <em>sides</em> of the tongue (that's why /l/ is called a lateral). Turn your voice on the whole time. Lips stay relaxed, no rounding or flaring. For the Dark L variant at the end of a syllable, also pull the back of the tongue up and back toward the soft palate.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
k/k/
Raise the back of your tongue to touch the soft palate (velum). Stop the air, then release.
yoo/ju/
Start with the tongue mid-front raised high, almost touching the roof of the mouth (but not touching). Glide into a tight lip circle as the tongue back lifts.
l/l/
DarkKeep the tongue tip down and pull the back of the tongue up toward the throat. The 'dark' sound comes from the back.
z/z/
Same position as S, but add vocal cord vibration. Feel the buzz.
In real conversation
Hear "molecules" in the wild.
Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
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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
Treating every L the same.
The L in "molecules" is a dark L — the back of the tongue rises toward the soft palate, adding a small "uh" quality before the L. Dark L adds a small schwa-like "uh" before the L. The back of the tongue lifts toward the soft palate.
molecules→MAH·luh·KYOOLZ
02
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch MAH — keep everything else short and quick.
mah·LUH·KYOOLZ→MAH·luh·KYOOLZ
03
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.
MAH·LUH·kyoolz→MAH·luh·KYOOLZ
Questions
Questions people ask about this.
How is "molecules" stressed in American English?
Stress falls on the first syllable — say "MAH" with a longer, fuller vowel and keep every other syllable short and quick. The respell "MAH-luh-kyoolz" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why does the second syllable in "molecules" 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 "MAH-luh-kyoolz" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "molecules" 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 "MAH-luh-kyoolz" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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