any of several ferns of the genus Woodwardia, having a chainlike row of sori on either side of the midrib of each fertile leaflet.
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- chaillu, paul belloni du,
- chain coral,
- chain drive,
- chain gang,
- chain gear,
- chain grate,
- chain letter,
- chain lightning
Origin of chain fern
An Americanism dating back to 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019