2 syllables: Ly, sine. Stress on Ly.
LEYE-seen
/ˈlaɪsin/
Lysine is pronounced LEYE-seen (/ˈlaɪsin/). It has two syllables (Ly-sine), with the stress on "Ly". Lysine is an essential amino acid used by the body to build proteins and support metabolism. In biochemistry, it is commonly referred to as Lys, and it plays a key role in collagen cross-linking and immune function. The term also appears in nutrition and medical contexts when discussing dietary requirements and supplementation.
nounLysine is an essential amino acid used by the body to build proteins and support metabolism. In biochemistry, it is commonly referred to as Lys, and it plays a key role in collagen cross-linking and immune function. The term also appears in nutrition and medical contexts when discussing dietary requirements and supplementation.
"Researchers added lysine to the culture medium to study protein synthesis."
"Lysine intake must be sufficient for optimal immune function and growth."
"Some people take lysine supplements to help manage herpes simplex outbreaks."
Pronunciation is LY-sine, with the primary stress on the first syllable. IPA US: /ˈlaɪsiːn/; UK: /ˈlaɪsiːn/; AU often /ˈlaɪsiːn/. Start with /laɪ/ as in 'lie', then /siː/ like 'sea', ending with /n/. The 'lys' portion sounds like 'lies', and the second syllable is 'een'. Audio resources: try Cambridge dictionary or Forvo for native audio; you’ll hear the crisp /ˈlaɪ.siːn/.”,
Common errors: misplacing stress (‘ly-SINE’ instead of ‘LY-sine’), shortening the second vowel (saying /ˈlɪsɪn/ or /ˈlaɪsɪn/), and pronouncing the final vowel as a schwa. Correction tips: keep stress on the first syllable /ˈlaɪ/ and hold the /iː/ lengthy in the second syllable /siː/; ensure the final /n/ is a clear alveolar nasal. Practice with minimal pairs like LY-sine vs lie-sin (not a real word; just for stress practice).
In US/UK/AU, the pronunciation remains /ˈlaɪ.siːn/ with a long /iː/ in the second syllable; the main differences are vowel quality and rhoticity. US tends to rhotically pronounce /r/ in surrounding speech but not in Lysine itself; UK is non-rhotic in many dialects, but Lysine still ends with /n/. Australian speech is generally non-rhotic and may feature a slightly shorter /iː/; overall, the core pronunciation is highly similar across these variants.
The challenge lies in the lilting /laɪ/ diphthong and maintaining a clear long /iː/ in the second syllable without reducing it to schwa. For non-native speakers, the sequence /laɪ.siːn/ can be tricky due to rapid consonant transitions and the need for a stable final /n/. Lip rounding is minimal, so focus on tongue glides, keeping the first syllable tense and clean, then elongate the /iː/ before the final /n/.
A unique point is the long second vowel /iː/ that follows the /s/ in Lysine, which can tempt learners to shorten it or mispronounce as /ˈlaɪsɪn/. Emphasize the vowel length after /si/ and guard against reducing the final /iː/ to a short /ɪ/. Visual cues: think of saying LY- and then a drawn-out SEA without changing the final nasal. IPA reminders: /ˈlaɪ.siːn/.
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Lysine derives from the Greek word lysis meaning ‘a loosening’ or ‘dissolution,’ via the Latin lysinus, before entering modern scientific usage to name the amino acid L-lysine. The “L-” designation comes from the stereoisomerism of the amino acid (L- vs D- forms) in biological systems; nearly all human protein synthesis uses the L-enantiomer. The term entered the scientific lexicon with early 20th-century amino acid research, solidifying in biochemical nomenclature as researchers identified essential AAs required in diet. First recognized in protein chemistry literature in the 1880s and 1900s as scientists isolated the amino acids, lysine’s role as an essential nutrient—one that cannot be synthesized by humans—was established mid-20th century, shaping dietary guidelines and supplement discussions that persist in clinical nutrition today.
💡 Etymology tip: Understanding word origins can help you remember pronunciation patterns and recognize related words in the same language family.
Help others use "Lysine" correctly by contributing grammar tips, common mistakes, and context guidance.
💡 These words have similar meanings to "Lysine" and can often be used interchangeably.
🔄 These words have opposite meanings to "Lysine" and show contrast in usage.
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Words that rhyme with "Lysine"
-ine sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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