One of the mysteries of the English language finally explained.
1Zoology and Anatomy. A specialized air-filled cavity within the body.
2Botany. An intercellular space in the tissue (especially the stem) of a plant; an air cavity.
3An air-filled compartment or cavity in a manufactured article or natural substance.
Late 18th century; earliest use found in Philosophical Transactions of the Royal Society of London. From air + cell. In sense 1a perhaps after French cellule aérienne.
air cell/ˈɛː sɛl/
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