2 syllables: Vac, cine. Stress on cine.
vak-SEEN
/ˌvæˈksin/
Vaccine is pronounced vak-SEEN (/ˌvæˈksin/). It has two syllables (Vac-cine), with the stress on "cine". Vaccine is a noun referring to a substance that stimulates the body's immune response to fight diseases, typically containing an antigen or weakened pathogen. It can be administered to prevent illness or, in some cases, to provide targeted immunological protection. The term is used in medical, public health, and everyday conversations about immunization and vaccines.
nounVaccine is a noun referring to a substance that stimulates the body's immune response to fight diseases, typically containing an antigen or weakened pathogen. It can be administered to prevent illness or, in some cases, to provide targeted immunological protection. The term is used in medical, public health, and everyday conversations about immunization and vaccines.
How to Pronounce Vaccine
"Researchers developed a new vaccine to protect against the virus variant."
"Public health officials urged people to get the seasonal flu vaccine."
"Some communities face delays in vaccine distribution due to supply constraints."
Vaccine is pronounced with the stress on the first syllable: /ˈvækˌsiːn/ in US and UK dictionaries. Break it into two syllables: VAK-sin, where the /æ/ is the short A as in cat, and the second syllable has a long /iː/ followed by /n/. For many speakers, the final -ine is pronounced like a long -een. Mouth posture: begin with an open jaw for /æ/, then raise the tongue for /iː/ while ending with a light nasal /n/. Audio reference links: you can check Forvo or pronunciation dictionaries for native speaker examples to hear the two-syllable rhythm.
Common mistakes include pronouncing it as one syllable (VAK-sen) or ending with a clipped /ən/ instead of /siːn/. Some learners shorten the second syllable to /ˌsiən/ or misplace the primary stress. Correction tips: ensure the first syllable holds primary stress with /æ/ as in cat, and elongate the second syllable to /siːn/. Practice linking the diphthong in the second syllable to a clean /siːn/ rather than a schwa. Use minimal pairs to feel the contrast between /æ/ and /iː/.
In US and UK, vaccine is two syllables with stress on the first: /ˈvækˌsiːn/. Rhoticity can influence the quality of the /r/—not present here—but vowel length and quality may shift slightly: US often preserves a clearer /æ/; UK speakers may show a slightly shorter /æ/. Australian speakers tend to keep the two-syllable pattern with a clear /æ/ followed by a long /iː/. Overall, the vowel in the second syllable remains a high front vowel, and the final -ce is a long /siːn/ in most dialects.
The difficulty lies in the sequence V- and -cine, where the second syllable uses a long high vowel /iː/ that follows a stressed open syllable, plus the nasal ending /n/. Some learners reduce /æ/ to a schwa or pronounce the second syllable as /ˈvækən/ or /ˈvækˌsiən/. The tip is to clearly separate the syllables: VAK-sin, push the jaw open for /æ/ and then glide into /siːn/. Mastery requires practicing the two syllable tempo and ensuring the final consonant is fully released.
Is the 'cine' portion always pronounced with a long /iː/ in all dialects? In most standard varieties, the second syllable ends with a long /iːn/ in careful speech, as in /ˈvækˌsiːn/. Some rapid speech or colloquial usage may reduce vowel length slightly or blend it with a shorter /ən/, but the conventional dictionary form remains /ˈvækˌsiːn/. Focusing on the long /iː/ helps maintain intelligibility, especially in medical and public health contexts.
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The word vaccine derives from the Latin vaccinus, meaning “of or relating to cows,” because the first successful smallpox vaccine used cowpox material (vaccinia virus) to provide protection. The term entered English in the 18th century after Edward Jenner’s pioneering work with cowpox as a safer alternative to variola virus. The root vacc- comes from vacca, meaning cow, which signified the animal source of the material used to provoke immunity. Over time, vaccine broadened to refer to inoculations using antigens derived from pathogens, weakened or inactivated, to stimulate protective immune responses. The concept of vaccination expanded in the 19th and 20th centuries as immunology advanced, with vaccines targeting a wide range of diseases. First known use in English is documented around 1798 in Jenner’s context, with vaccine as a generic term later solidified in medical lexicon. Today, the word encompasses a broad class of biological therapies that educate the immune system to recognize and combat pathogens without causing the disease itself, and it remains central to public health discourse and clinical practice.
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💡 These words have similar meanings to "Vaccine" and can often be used interchangeably.
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Words that rhyme with "Vaccine"
-age sounds
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