2 syllables: gly, cine. Stress on gly.
GLEYE-seen
/ˈɡlaɪˌsin/
glycine is pronounced GLEYE-seen (/ˈɡlaɪˌsin/). It has two syllables (gly-cine), with the stress on "gly". Glycine is a simple, nonessential amino acid with the symbol Gly and the formula C2H5NO2. It functions as a building block for proteins and acts as an inhibitory neurotransmitter in the central nervous system. In biochemistry contexts, glycine is discussed in terms of its small size, flexible conformation, and role in collagen and metabolic pathways.
Glycine is a simple, nonessential amino acid with the symbol Gly and the formula C2H5NO2. It functions as a building block for proteins and acts as an inhibitory neurotransmitter in the central nervous system. In biochemistry contexts, glycine is discussed in terms of its small size, flexible conformation, and role in collagen and metabolic pathways.
Tip: record yourself saying glycine, compare with an authoritative pronunciation source, and adjust the length of the final vowel. Focus on sustaining the /iː/ through the /n/ to avoid a clipped ending.
"Researchers analyzed glycine transport across the cell membrane."
"Glycine is the simplest amino acid and often used in protein synthesis studies."
"In biochemistry labs, glycine is employed as a buffering agent in electrophoresis."
Pronounce glycine as /ˈɡlaɪ.siːn/. The first syllable stresses 'GLY' with an open fronted vowel followed by a long 'ee' quality in the second syllable. Your mouth starts in a low central to high front position for /ɡlɪ/ then moves to a long /iː/ in the final syllable. Think 'GLY' as in 'gly' and 'seen' with a long 'ee' sound. You’ll hear a crisp, short /ɡ/ onset, a diphthong in /aɪ/ and a steady /siːn/ ending. Audio references: Cambridge and Oxford dictionaries provide IPA you can compare with your own recording.
Common errors include misplacing the /ɡ/ plosive, lengthening the first vowel too much, or compressing the final /iː/ into a short /i/. To correct: start with a clean /ɡ/ onset, transition quickly into the /aɪ/ diphthong without delaying, then open to a clear /siːn/ with a long /iː/ and a voiced n. Ensure the second syllable carries the main vowel length and avoid reducing /siːn/ to /sin/.
In US and UK, glycine carries stress on the first syllable: /ˈɡlaɪ.siːn/. The rhoticity of /ɡl/ is non-rhotic in careful UK speech, but /ɡl/ remains blended. The vowel in the second syllable is a long /iː/ in both dialects, though UK speakers may slightly reduce the preceding /ɪ/ color in rapid speech. Australian speakers typically maintain the same two-syllable structure with the same /ˈɡlaɪ.siːn/ pattern, but may have a subtly flatter intonation and a slightly shorter /iː/ due to Australian vowel length tendencies.
Glycine challenges English learners due to the diphthong in the first syllable /aɪ/ after the hard onset /ɡl/, plus a two-syllable rhythm with a long vowel in the second syllable /iː/. The combination of a cluster onset /ɡl/ and a long vowel in the final syllable can invite mispronunciation like 'gly- sin' or 'glai-sin' with an American 'sin' ending. Take care to keep /siːn/ as a long, tense nucleus and avoid shortening the /iː/. Practice by isolating each phoneme and integrating them fluently.
A distinctive feature is the long final /iːn/ sound that requires catching the prolonged /iː/ before the final nasal /n/. The top-of-voice start with /ɡ/ followed by the tense /laɪ/ cluster and a high-front closing vowel in the second syllable. Emphasize the second syllable vowel length and the trailing nasal to avoid clipping the final consonant. This often trips speakers who are used to shorter vowel lengths in sci-tech terms.
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Glycine derives from the Greek word glykys meaning 'sweet', reflecting early observations of its relatively mild taste in certain contexts. The term entered biochemical lexicon in the 19th and 20th centuries as organic chemists isolated amino acids from proteins. Its naming aligns with the suffix -ine common to amino acids (glycine, alanine, valine) and with the root 'glyc-' used in sugar-related chemistry, though glycine itself is not a sugar. First recognized in foundational protein chemistry work, glycine’s identity as the simplest amino acid with a single hydrogen as its side chain (R group) highlighted its structural role in peptide chains and protein folding. Over time, glycine has become central in discussions of collagen structure, where its small size is crucial for the triple helix, and in studies of neurotransmission, metabolism, and Cryo-EM protein models. The dual nature of glycine—nonpolar but non-aromatic—contributes to its unique conformational flexibility, enabling tight turns and flexible linkages in peptides. The modern, systematic use of the term in nutrition and biochemistry reflects its status as one of the 20 canonical amino acids, standardized in the early 20th century through amino acid sequencing and protein chemistry advancements.
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💡 These words have similar meanings to "glycine" and can often be used interchangeably.
🔄 These words have opposite meanings to "glycine" and show contrast in usage.
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Words that rhyme with "glycine"
-ine sounds
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