One of the mysteries of the English language finally explained.
1Botany. In certain ferns: a specialized structure with numerous stomata for aeration, usually seen as a band of pale tissue on the stem or a small outgrowth at the base of a frond.
2Any of several forms of respirator, especially one with a portable supply of air for use by divers and miners. Now historical.
Mid 19th century; earliest use found in William Hooker (1785–1865), botanist. From aero- + -phore.
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