Alveolus (plural alveoli) is the scientific word for a cavity. In baking, alveoli are the bubbles or gas cells that aerate bread and cakes and give them their sponge-like texture. Although the word isn't in widespread use by bakers themselves, it is often seen in research literature about baking.
Want to find out more? Look at the chapter on rising, proving and fermentation in the book flour and water.
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