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单词 tree fern
释义

WordReference Random House Unabridged Dictionary of American English © 2024
tree fern′, 
  1. any of various ferns, mostly tropical and chiefly of the family Cyatheaceae, that attain the size of trees, sending up a straight trunklike stem with foliage at the summit.
  • 1840–50

Collins Concise English Dictionary © HarperCollins Publishers::
tree fern n
  1. any of numerous large tropical ferns, mainly of the family Cyatheaceae, having a trunklike stem bearing fronds at the top
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