f/f/
Lift your bottom lip to touch the very bottom of your top front teeth. Blow air through this contact point without voicing.
How to pronounce fertilize in American English
FUR·tuh·lahyz
Start here
Americans pronounce fertilize as FUR-tuh-lahyz (/ˈfɜrɾəˌlaɪz/). In "fertilize", 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. It comes out as FUR·tuh·LAHYZ. Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "He uses compost to fertilize the garden naturally".
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Sound by sound
Every sound in "fertilize".
3 syllables, 7 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
ur/ɜr/
Flare your lips and push them away from the face. Lift the middle of your tongue toward the roof of the mouth.
t/t/
FlapQuickly bounce the front of your tongue against the roof of your mouth. Don't stop the airflow — just a quick tap.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
l/l/
SyllabicThe schwa before L disappears — L becomes the vowel of the syllable. Go straight from the previous consonant to a Dark L.
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.
z/z/
Same position as S, but add vocal cord vibration. Feel the buzz.
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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 "fertilize", 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.
FUR-tuh-lahyz→FUR·tuh·LAHYZ
02
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch FUR — keep everything else short and quick.
fur·TUH·LAHYZ→FUR·tuh·LAHYZ
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.
FUR·TUH·lahyz→FUR·tuh·LAHYZ
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 "fertilize" stressed in American English?
Stress falls on the first syllable — say "FUR" with a longer, fuller vowel and keep every other syllable short and quick. The respell "FUR-tuh-lahyz" 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 "fertilize"?
In American English, when /t/ sits between two vowels with the second one unstressed, it turns into a quick D-like flap. So "fertilize" sounds closer to "FUR-tuh-lahyz" 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 "fertilize" 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 "FUR-tuh-lahyz" shows the reduced form so you can hear the casual rhythm directly.
How do I pronounce the R in "fertilize"?
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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