3 syllables: ni, a, cin. Stress on ni.
NEYE-uh-suhn
/ˈnaɪəsən/
niacin is pronounced NEYE-uh-suhn (/ˈnaɪəsən/). It has three syllables (ni-a-cin), with the stress on "ni". Niacin is a B vitamin (B3) essential for energy metabolism and DNA repair. It occurs in several forms and is used therapeutically to manage cholesterol levels. In everyday contexts, it appears in nutrition discussions, supplements, and biochemistry literature. The term blends medical vocabulary with common dietary usage, making precise pronunciation important for both clinical and lay audiences.
Niacin is a B vitamin (B3) essential for energy metabolism and DNA repair. It occurs in several forms and is used therapeutically to manage cholesterol levels. In everyday contexts, it appears in nutrition discussions, supplements, and biochemistry literature. The term blends medical vocabulary with common dietary usage, making precise pronunciation important for both clinical and lay audiences.
- Not fully pronouncing the final 'in' (/ɪn/) and reducing it to /n/; ensure you release the final syllable clearly. orvo usage: listen to multiple speakers to hear variations. - Inserting an extra 'a' sound in the middle syllable (/æ/ as in 'cat'); keep the middle vowel as a reduced /ə/ or /ɪ/ sound depending on the speaker. - Misplacing the primary stress on the second syllable; the stress is on the first syllable.
"She started a niacin supplement to support her lipid profile."
"Niacin deficiency can lead to pellagra if dietary intake is chronically low."
"The researchers studied niacin's role in cellular energy production."
Commonly pronounced as /ˈnaɪ.əsɪn/ (nye-uh-sin) in both US and UK, with a secondary syllable schwa-like onset. The first syllable carries primary stress. In careful medical speech you may hear /ˈnaɪ.ə.sɪn/ with a light schwa between ni- and as- (nye-uh-sin). For the Australian accent, most speakers follow /ˈnaɪ.əsɪn/ similar to US, with a slightly closer 'i' in the second syllable.
Two common errors are shortening to /ˈnaɪəsn/ (omitting the final 'in' sound) and turning the middle 'a' into a hard 'a' as in 'cat' (/ˈnaɪæ.sɪn/). Correct by keeping the second syllable unstressed and fully pronouncing the 'ɪ' in the final syllable. Aim for /ˈnaɪ.əsɪn/ with clear schwa or light /ə/ between syllables.
In US and UK, the word typically uses primary stress on the first syllable: /ˈnaɪ.əsɪn/. The vowel in the first syllable is a diphthong /aɪ/, and the middle vowel tends toward a schwa or near-schwa /ə/ or /ɪ/ in careful speech. In Australian speech, you’ll hear similar /ˈnaɪ.əsɪn/ but with a flatter intonation and a less pronounced rhotic quality; the final syllable /sɪn/ remains.
The challenge lies in preserving the three-syllable rhythm with accurate diphthong in the first syllable (/aɪ/), and a reduced middle vowel that remains audible yet unstressed. Speakers often run /ˈnaɪ.əsɪn/ together, causing a blurred /ə/ or /ɪ/ in the middle. Additionally, non-native speakers might misplace stress or misrender the final 'in' as /ɪn/ rather than a light /ən/ or /ɪn/.
In careful clinical diction you may hear a subtle secondary peak on the second syllable, yielding /ˈnaɪ.ə.sɪn/ for emphasis on the middle vowel. This mirrors some medical terms where a light /ə/ attaches between consonant clusters. Practicing with a brief pause after the first syllable can help maintain the rhythm and prevent clipping the final -in.
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- US: /ˈnaɪ.əsɪn/ with the first syllable as a clear diphthong /aɪ/. The middle vowel often reduces to /ə/; keep it quick and light. - UK: Similar pattern, but some speakers enunciate the middle vowel slightly more, giving a smidge of /ɪ/ or /ə/. - AU: Tends to be slightly flatter intonation; keep the /aɪ/ diphthong intact and avoid an overly rounded vowel in the middle. Use IPA guide /ˈnaɪ.əsɪn/.
Niacin derives from nicotinic acid, reflecting its chemical root in pyridine carboxylic acid structures. The term likely originated in the 1940s as scientists formalized the vitamin’s identity and isolated forms such as nicotinic acid and nicotinamide. The root nicotin- traces to nicotinic acid’s relation to nicotine’s chemical family, though niacin itself is unrelated to tobacco. The suffix -in is a common English ending for vitamins (lin-), although it does not imply a biological connection. First known usage appears in scientific literature around the 1940s when pellegra-related nutrient deficiencies were being investigated, and niacin was identified as a treatment.”,
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Words that rhyme with "niacin"
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