Alveoli are tiny air sacs at the ends of the lungs' air passages where gas exchange occurs. The term also appears in botany to describe small cavities in plant tissues. In medical contexts, alveoli refer to these microscopic sacs, essential for oxygen uptake and carbon dioxide removal. The word is plural; the singular is alveolus.
"The alveoli expand as you inhale and contract with each breath."
"Diseases like emphysema damage the walls of the alveoli, reducing gas exchange."
"The cough helps clear mucus from the alveoli and airways."
"Researchers studied alveolar membranes to understand diffusion of gases."
Alveoli comes from Latin alveolus, meaning a small hollow or cavity, diminutive of ala ‘wing’ or ‘nave.’ The term entered anatomical vocabulary in the 18th century, derived from the Latin alveolus, used in architecture and botany to denote hollow cavities. In anatomy, early anatomists borrowed alveolus to describe small hollow air sacs; the plural form alveoli follows Latin-derived pluralization. The sense expanded as histology clarified the microscopic lung structure, where alveoli are the final site of the respiratory tree. The word retained its core sense of tiny cavities or hollows across disciplines—hollow structures for gas exchange in lungs, and small cavities in plant tissues. The first known English medical uses appear in the late 1700s as anatomy advanced and microscopes revealed alveolar structures; the term became standard in respiratory physiology by mid-19th century with the rise of modern pulmonary science.
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Words that rhyme with "Alveoli"
-lly sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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Pronounce as al-VEE-oh-ly with three syllables. Stress falls on the second syllable: /ˌælv.iˈoʊ.li/ (US) or /ˌæl.viˈɒl.i/ (UK). The key is a clear 'alve' onset followed by a bright long 'oh' in the second syllable and a light final 'ee-lee' in some accents. Listen for a crisp alveolar transition between 'al' and 'veo'.
Two frequent errors: 1) Flattening the second syllable into a quick schwa: say it as a distinct VEE-oh rather than a muted sound. 2) Misplacing stress: place stress on the second syllable rather than the first. Correct by practicing al-VEE-oh-lee with deliberate loudness on the second syllable and accurate vowel sounds.
US tends to a stronger schwa-less pre-tonic vowel in 'al,' with a clear long 'oh' in the third syllable and rhotic influence, yielding /ˌælv.iˈoʊ.li/. UK avoids rhotics, with /ˌæl.viˈɒl.i/ and a shorter 'o' quality; AU similar to UK but often closer to /ˌælv.iˈɒl.i/ with a flatter final syllable depending on speaker. Focus on the central vowel quality and final light 'ee/lee' ending in most dialects.
Because it combines a front-alveolar onset with a high back vowel cluster and a trailing unstressed syllable. The second syllable carries stress, but the 'eo' sequence often confuses non-native speakers who expect simpler vowel patterns. The final -li adds a soft, light ending that can blur in rapid speech; careful isolation and tempo control help.
The word includes a three-syllable structure with a prominent second-syllable stress and a two-vowel sequence 'eo' that yields a tense, high back vowel in many dialects. The tricky transition between the syllables requires crisp articulatory timing: alve- has a strong alveolar stop, followed by a clear, elongated 'oh' and a lighter 'lee' end. IPA cues clarify these transitions.
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