noun
a type of ferns
adjective
describing the type of ferns that belong to the adder
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The botanist carefully studied the intricate patterns of adder's-ferns in the forest.
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I love how adder's-ferns look in the wild, they're so unique!
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Those adder's-ferns are totally rad, dude!
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The adder's-ferns spread across the forest floor like a green carpet.