4 syllables: am, pi, cil, lin. Stress on pi.
am-PIS-il-in
/æmˈpɪsɪlɪn/
ampicillin is pronounced am-PIS-il-in (/æmˈpɪsɪlɪn/). It has four syllables (am-pi-cil-lin), with the stress on "pi". Ampicillin is a broad-spectrum penicillin antibiotic used to treat bacterial infections. It is typically administered orally or by injection and works by inhibiting bacterial cell wall synthesis. The term combines the core antibiotic class with the chemical suffix '-cillin,' indicating beta-lactam structure and mechanism.
Ampicillin is a broad-spectrum penicillin antibiotic used to treat bacterial infections. It is typically administered orally or by injection and works by inhibiting bacterial cell wall synthesis. The term combines the core antibiotic class with the chemical suffix '-cillin,' indicating beta-lactam structure and mechanism.
"The patient was prescribed ampicillin to combat a gastrointestinal infection."
"Researchers studied ampicillin's pharmacokinetics in healthy volunteers."
"She was intolerant of ampicillin and switched to an alternative antibiotic."
You say am-PIL-ih-sin with the primary stress on the second syllable. IPA: US ˌæm.pɪˈsɪl.ɪn, UK ˌæm.pɪˈsɪl.ɪn, AU ˌæm.pɪˈsɪl.ɪn. Start with /æ/ as in 'cat', then /m/ with the lip closed, /p/ as a stop, and stress falls on the /ˈsɪl/ syllable. End with /ɪn/.
Common errors: (1) stressing the wrong syllable, often saying am-PI-ci-lin; (2) merging/omitting the middle consonant cluster: saying am-pi-silin; (3) mispronouncing the ending as -sin instead of -sɪl. Correction: emphasize the second syllable /ˈsɪl/ and clearly pronounce the /l/ before the final /ɪn/. Practice with slow, exaggerated enunciation then normalize.
In US and UK, the stress remains on the second syllable, but UK vowels are often drawn out slightly, with a clearer /ɪ/ in the /sɪl/ portion. Australia keeps the same stress pattern but may have a shorter /ɪ/ in casual speech. Practically, listen for rhoticity: US and AU are rhotic in most dialects; UK often non-rhotic in careful speech, but medical terms retain pronouncing the r when followed by vowels.
Key challenges include the consonant cluster /mp/ followed by /ɪ/ leading into /sɪl/; the second syllable /pɪl/ is not a common English sequence for all learners, and the final /ɪn/ can be run together in fast speech. Focus on keeping a clean /m/ with a slight lip seal, then a distinct /p/ stop, and a crisp /sɪl/ before the final /ɪn/.
A notable feature is the /p/ + /ɪl/ sequence immediately after the initial /æm/; some speakers merge the /ɪl/ too quickly, producing /ˈæmpɪlən/ instead of /ˌæm.pɪˈsɪl.ɪn/. Paying attention to the mid syllable /sɪl/ helps maintain the correct medical term rhythm.
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Ampicillin derives from the combination of amp- (a prefix indicating amine groups from the ampicillin molecule) and -cillin, the common stem for penicillin-type antibiotics. The root penicillin traces to Fleming’s discovery (1928) of the penicillium mold producing penicillin, with
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💡 These words have similar meanings to "ampicillin" and can often be used interchangeably.
🔄 These words have opposite meanings to "ampicillin" and show contrast in usage.
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Words that rhyme with "ampicillin"
-lin sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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