|Main Entry:||air fern|
|Part of Speech:||n|
|Definition:||a plant made of the skeletal remains of a species of marine animal, <i>Sertularia argentea</i>, which resembles a fern when dyed green and is distantly related to coral; also called Neptune plant|
|Example:||The self-sustaining air fern is only found at the bottom of the English Channel.|
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