3 syllables: Os, mo, sis. Stress on mo.
awz-MOH-sis
/ˌɔˈzmoʊsɪs/
Osmosis is pronounced awz-MOH-sis (/ˌɔˈzmoʊsɪs/). It has three syllables (Os-mo-sis), with the stress on "mo". Osmosis is a noun referring to the passive movement of a solvent (usually water) through a semipermeable membrane from a region of lower solute concentration to higher solute concentration. In everyday language, it also denotes the way ideas, skills, or behaviors gradually spread within a group. The term originates from biology but is widely used metaphorically in social and informational contexts.
nounOsmosis is a noun referring to the passive movement of a solvent (usually water) through a semipermeable membrane from a region of lower solute concentration to higher solute concentration. In everyday language, it also denotes the way ideas, skills, or behaviors gradually spread within a group. The term originates from biology but is widely used metaphorically in social and informational contexts.
- You often misplace the primary stress on the first syllable. Fix: punch the stress on the second syllable (os-MO-sis) and keep the first syllable lighter. - The middle vowel can slur into a neutral schwa in rapid speech. Fix: maintain a clear /oʊ/ or /əʊ/ quality for /moʊ/ or /məʊ/ depending on your accent. - Ending consonant can be devoiced or rushed. Fix: finish with a crisp, audible /sɪs/ rather than a whispered or voiceless ending. - Blending across syllables can blur the rime; isolate /moʊ/ or /məʊ/ for 2–3 repetitions before combining with /sɪs/.
How to Pronounce Osmosis
"The medical student studied osmosis to understand how fluids move in cells."
"In business, the culture of teamwork spread by osmosis as new employees observed the veterans."
"If you surround the plant roots with a solution, osmosis will draw water into the roots."
US/UK/AU: os-MO-sis. IPA: US ˌɒzˈmoʊ.sɪs, UK ˌɒzˈməʊ.sɪs, AU ˌɒzˈmə.sɪs. Start with /ɒ/ as in 'cot', stress the second syllable with a clear /ˈmoʊ/ or /ˈməʊ/ diphthong, and end with /sɪs/. Ensure the 's' at the end is crisp, not 'sizzled'.
Two common errors: (1) misplacing stress on the first syllable (os-MO-sis is correct); (2) pronouncing the middle vowel as a long /iː/ or using a pure /i/ instead of the correct /oʊ/ or /əʊ/ depending on accent. Correction: keep the primary stress on the second syllable and use a proper mid-to-high back rounded vowel in /moʊ/ (US) or /məʊ/ (UK/AU). Finish with a crisp /sɪs/.
US uses /ˌɒzˈmoʊ.sɪs/ with /oʊ/ diphthong; UK uses /ˌɒzˈməʊ.sɪs/, often a reduced second syllable vowel /ə/. Australian blends can vary between /ˌɒzˈmə.sɪs/ and /ˌɒzˈmɒ.sɪs/, with less rhoticity leading to a softer post-vocalic 'r' not present in osmosis but affecting nearby vowels. The main difference is the middle vowel: US /moʊ/ vs UK /məʊ/ and AU tendency toward a shorter schwaish middle.
Three main challenges: (1) the secondary-stress on the 'MO' vowel requires a clear diphthong /oʊ/ or /əʊ/ that can blur with a reduced vowel in fast speech. (2) The syllable boundary creates a subtle transition: /z/ ends the first syllable, then /ˈmoʊ/ or /məʊ/ begins, which in fast speech can blend. (3) Ending /sɪs/ includes a sibilant cluster that can be misarticulated as /zɪz/ if you voice the ending. Practice by isolating middle vowel and final sibilant.
Unique to osmosis is the strong secondary stress on the second syllable while the first syllable carries weaker energy. This pattern emphasizes /ˈmoʊ/ or /məʊ/ rather than a heavy first syllable. The ending -sis attaches as /sɪs/; ensure the /s/ is aspirated crisply and not glottalized in rapid speech.
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- US: emphasize /ˌɒzˈmoʊ.sɪs/ with a bright /oʊ/ diphthong; keep /z/ voiced but not elongated. - UK: /ˌɒzˈməʊ.sɪs/ uses /əʊ/ in the second syllable and a more reduced first vowel; avoid rhoticity creeping into /ɒ/; the final -sis remains /sɪs/. - AU: tends to flatter vowels, sometimes merging /ə/ to a near-schwa in the second syllable; keep the /oʊ/ or /əʊ/ clearly differentiated from /ɪ/; maintain non-rhoticity in coda. IPA references: US /ˌɒzˈmoʊ.sɪs/, UK /ˌɒzˈməʊ.sɪs/, AU /ˌɒzˈmə.sɪs/.
Osmosis comes from the Greek osmo, meaning a pushing or thrusting, from the verb osmizein, to push. The scientific term was coined in the early 19th century, building on the Greek 'osmo-' (push, impulse) and the suffix '-sis' indicating action or process, common in scientific nomenclature. The root osme originally referred to a scent or smell in ancient Greek, but in the biological sense it shifted to the idea of a difference in concentration driving movement across membranes. In late 19th century biology, osmosis was formalized as the passive movement of solvent across a semipermeable membrane. The word expanded beyond pure biology in the 20th century to describe metaphorical diffusion of ideas or behaviors. First known usage in English literature appears in scientific texts around 1850s–1860s as researchers described solvent movement in plants and cells, solidifying osmosis as a foundational concept in physiology and chemistry, before becoming a common metaphor in education, psychology, and business discourse.
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Words that rhyme with "Osmosis"
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