/ˈaɪsəmɚ/
Say it backAn isomer is a chemical compound with the same molecular formula as another compound but a different arrangement of atoms, resulting in distinct structures and properties. In practice, isomers can differ in connectivity (structural isomers) or spatial orientation (stereoisomers). The term is often used in organic chemistry to discuss variations among compounds having equal numbers of each element.
"The isomeric forms of butane include n-butane and isobutane, which have different shapes and boiling points."
"Researchers studied the isomerism of coordinating ligands to understand reactivity patterns."
"Chiral isomers can rotate plane-polarized light in different directions, a property key to stereochemistry."
Say IS-oh-mer with primary stress on IS. In IPA: US /ˈaɪˌsɒmər/ or /ˈaɪ.sɒ.mə/ UK/AU alike. Start with a high front diphthong on /aɪ/, then an open-back /ɒ/ for the stressed second syllable fragment, and end with a rhotacized or schwa-like /ər/ depending on accent. Keep the first syllable crisp and avoid over-long vowels. You’ll hear a slight reduction in the final syllable in rapid speech.”,
Common errors include diluting the /aɪ/ into a simple /ɪ/ or /iɪ/ and making the second syllable /som-er/ sound like /soh-mer/ without the subtle /m/ closure. Another frequent slip is misplacing the /s/ or blending /sɒm/ too tightly with /ər/. The corrective tip: emphasize the /aɪ/ diphthong clearly, release the /s/ crisply, and finish with a short /ər/ or /ə/ depending on accent. Practice the three-syllable cadence slowly, then speed up to natural tempo.”,
In US English, you often hear /ˈaɪ.səˌmɚ/ or /ˈaɪˌsoʊ.mɚ/, with rhoticity affecting the final /ɚ/. UK pronunciation tends to be /ˈaɪˌsɒ.mə/ with a less rhotic final, and a slightly shorter /ɒ/ in many regions. Australian can be similar to UK but may exhibit vowel broadening and a clearer /ə/ in the final syllable. Across all, the /aɪ/ onset is stable; the main variation is the middle syllable vowel and the rhoticity of the final syllable.
Two core challenges: the diphthong /aɪ/ in the first syllable can be hurried or replaced with a simpler vowel, and the /ɪ/= or /ɒ/ quality in the middle varies by speaker; plus the final /ər/ or /ə/ can be reduced in fast speech. Mastery requires isolating the three phoneme blocks, maintaining a steady syllable rhythm, and ensuring the middle /sɒm/ is a clear, single unit rather than a blend. Keep your jaw relaxed for a smooth transition.”],
In standard usage, primary stress sits on the first syllable: IS-o-mer. Some speakers, especially in rapid scientific speech, may place mild secondary emphasis on the second syllable to signal a compound word’s structure, but this is not typical. If you stress the second syllable, it can sound unusual or labored. Aim for primary stress on IS, with a brisk, light second syllable.
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US: stress on IS; pronounce /ˈaɪˌsɒ.mɚ/ with a pronounced /ɚ/ or /ər/ depending on region. UK: /ˈaɪ.sɒ.mə/ with a less rhotic ending; AU: similar to UK but with slight vowel coloration; emphasize /aɪ/ and /ɒ/ clearly, and keep final schwa short. IPA anchors: US /ˈaɪˌsɒ.mər/; UK /ˈaɪˌsɒ.mə/; AU /ˈaɪˌsɒ.mə/.
The word isomer comes from the Greek isos, meaning 'equal' or 'the same', and meros, meaning 'part' or 'portion'. The term was adopted in the 19th century to describe compounds that share the same molecular formula but differ in the arrangement of their parts. Early chemists observed that two substances could have identical elemental composition while exhibiting different properties, prompting the concept of isomerism. The first explicit use of the term occurred in the mid-1800s as structural chemistry advanced, with luminaries like molecular theorists noting that equal parts could assemble in alternative ways to yield distinct substances. The evolution of isomer concept paralleled developments in nomenclature and structural theory, including the introduction of constitutional isomerism and stereoisomerism. Over time, the definition expanded to encompass geometric and optical isomers, as techniques such as crystallography and chiroptical methods provided means to distinguish isomers beyond simple formulae. Today, ‘isomer’ remains central to understanding reactivity, pharmacology, and materials science, reflecting how spatial arrangement translates to function.
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Words that rhyme with "isomer"
-mer sounds
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