单词 | prickly shield fern |
释义 | prickly shield fernnoun Any of several shield ferns of the genus Polystichum; especially P. aculeatum of Eurasia and North Africa, which has leathery fronds and distinctive bristle-toothed pinnules. OriginEarly 19th century; earliest use found in James Edward Smith (1759–1828), botanist. |
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