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World English Dictionary
lady fern
 
n
a large, graceful, but variable fern, Athyrium filix-femina, with bipinnate fronds, commonly found on damp acid soils in woods and on hillsides

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
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lady fern

a large, feathery fern classified in the family Woodsiaceae, widely cultivated for ornamentation. Leaves are about 75 cm (30 inches) long and 25 cm (10 inches) wide and grow in circular clusters. Characteristic of the genus are curved or horseshoe-shaped spore-producing clusters (sori) that are covered by a fringed, membranous protective structure (indusium). Lady ferns occur in moist, semi-shaded areas in the temperate zones of the world

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Ostrich ferns are abundant, while the rattlesnake fern and lady fern are rare.
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