2 syllables: es, ters. Stress on es.
/ˈɛstɚz/
Say it backEsters are organic compounds derived from water by replacing the hydrogen of a carboxyl group with an alkyl or aryl group, typically formed from alcohols and carboxylic acids. They often have fragrant smells and are used in flavors, fragrances, and solvents. In chemistry, esters are identified by the characteristic carbonyl adjacent to an OR group (R-COOR').
"The esters give the fruit its characteristic aroma."
"Liquid esters are commonly used as solvents in the laboratory."
"Fatty esters form the basis of fats and oils in biology."
Pronounce as ES-tərz in US/UK. Primary stress on the first syllable: /ˈɛs.tərz/ in US, with a slight schwa in the second syllable, sometimes /ˈes.təz/ in UK. The final consonant is a voiced /z/. Mouth: start with a crisp /ɛ/ as in ‘bet,’ then the /s/, then a light /t/ followed by a relaxed /ər/ (schwa + r-colored vowel in some accents), ending with /z/. Listen for a clean transition between /s/ and /t/ and a voiced end.
Common errors: 1) Slurring /t/ into the following vowel, making /ˈɛstərz/ sound like /ˈe.stɚz/; 2) Not voicing the final /z_, giving a /s/ or /ʃ/ sound instead of /z/; 3) Over-syllabicating the second syllable, pronouncing /ˈes.tə rz/ with a full vowel in the second syllable.Correction: keep a crisp /t/ before a short /ər/ and ensure the final /z/ voice. Practice by isolating the /st/ cluster and finishing with a clear /z/.
US tends to preserve /ˈɛstərz/ with a clear /r/ coloring in /ər/ and a terminal /z/. UK often reduces /ər/ toward /ə/ after /t/, giving /ˈes.təz/ and a weaker rhoticity in non-rhotic varieties; AU follows similar patterns to UK but with a slightly flatter /ɜ/ or /ə/ depending on speaker. The main difference is rhoticity and the perceived vowel quality in the second syllable: US more rhotic, UK less so, AU intermediate. Listen for the realisation of /ɜː/ vs /ə/ in the second syllable.
The difficulty comes from the /st/ cluster followed by a voiced /z/ and a rapid /ər/ in the second syllable. The transition from /st/ to /ər/ can cause a vowel length mismatch, and the final /z/ must be voiced, not devoiced as /s/. Additionally, regional rhoticity and vowel reduction affect clarity: US speakers often keep a stronger rhotic /r/ coloring; UK speakers may reduce the second vowel more. Focus on crisp /st/ release and a voiced, relaxed final /z/.
No silent letters in esters. All letters contribute to sound: E-S-T-E-R-S. However, the second syllable vowel can be reduced to a schwa in many accents, making /ˈɛstərz/ sound like /ˈes.təz/ in casual speech.
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The word ester comes from the German chemist R. A. von Hoffmann’s term ‘Ester’ derived from German ’Ester’ in the 1840s, which itself was influenced by French ’ester’ and Latinized forms used in early organic chemistry. The concept arose as chemists recognized compounds formed from carboxylic acids and alcohols, when their OH group is replaced by OR. The suffix -ester mirrors other labile organic groups, linking to 'esterification' processes where an alcohol attacks a carboxylic acid to form water and an ester. Early naming conventions assigned -ester to the product family, and the term gradually became standard in chemical literature by mid-19th century. First uses appeared in foundational organic chemistry texts as chemists explored condensation reactions, particularly esterification, transesterification, and hydrolysis. The term was further refined as structural theory advanced, with the carbonyl adjacent to an OR group being the defining feature. In modern usage, esters are ubiquitous in biochemistry, materials science, and industrial chemistry, with thousands of distinct esters known and continually studied for flavor, fragrance, and solvent applications.
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Words that rhyme with "esters"
-ers sounds
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